Added xml_attribute::as_string and xml_text::as_string, added default value to all as_* member functions

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contrib: Foreach contrib file is not really needed any more; left for compatibility, + removed node/attribute adapters since we now have object range support in pugixml.hpp

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Introduced xml_named_node_iterator, introduced xml_node::children() and xml_node::attributes() for C++11 range-based for loop

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Write BOM as U+FEFF to buffered writer; this makes sure we don't have a very small unbuffered write with custom writer implementations

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Fixed strict aliasing violation warning in output buffer conversion via union. Fixed BlackBerry NDK -O3 compilation in header-only wchar mode.

git-svn-id: http://pugixml.googlecode.com/svn/trunk@869 99668b35-9821-0410-8761-19e4c4f06640

STL forward declaration experiment failed; revert to using STL headers. Reasons: bugs in old compilers (i.e. SunCC, DMC, BCC require using the same names in forward declarations as in actual declarations), incompatibility between buggy compilers and different STL versions (i.e. SunCC has two STL versions with mismatching names), problems with C++0x inline namespaces (used in Clang libc++, see http://llvm.org/bugs/show_bug.cgi?id=5590), and this is an undefined behavior so other problems may come up.

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Explicitly ignore fwrite result - nothing else can be done with the current writer interface, unfortunately

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Intel C++ 11 has the same warning pop bug... Disable warning popping on all Intel C++ versions. Fixes Intel C++ 11 compilation in PUGIXML_NO_STL mode.

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Added PUGIXML_MEMORY constants for tweaking memory behaviour; useful for embedded systems or for unusual cases (i.e. thousands of small documents in memory)

git-svn-id: http://pugixml.googlecode.com/svn/trunk@860 99668b35-9821-0410-8761-19e4c4f06640

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Dereferemce operators in both iterators are now const; this fixes iterator compatibility with parts of Boost Iterator (i.e. filter_iterator). It is now possible to damage the state of const_iterator by directly mutating internal handle - working around that introduces additional performance penalties and is generally extremely unlikely to be useful - constant iterator objects are rarely used.

git-svn-id: http://pugixml.googlecode.com/svn/trunk@858 99668b35-9821-0410-8761-19e4c4f06640

Different versions of RWSTL have different headers; revert the previous change and instead introduce PUGIXML_NO_STL_FWDDECL macro (that disables forward declaration of STL classes, which is not compliant).

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Implemented optional header-only mode (still need to do a couple of fixes for rare compilers, but it seems to work on the majority of configurations). Tests work in header-only mode, but testing is not enabled yet (still a bit more work to be done, and compiling header-only tests is up to 4 times slower, so we can't test more than one-two configurations per toolset)

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