Continued debugging BP1 Writer for a single variable write

Pull request to Jason's branch

Run ./buildDataman.sh see contents for detailed info

see examples/hello/dataman and examples/hello/writer for working
examples

Corrected bug by including cmath in adiosFunctions.cpp

Removed helloWriter.cpp and helloDataMan.cpp, now using
helloDataMan_OOP.cpp and helloWriter_OOP.cpp

DataMan class implemented under include/engine/dataman and
src/engine/dataman

Implemented transport MdtmMan used by DataMan engine under
include/transport and src/transport. This will serve as the basis for
WAN transport

Modified Makefile to include DataMan paths

To do:

Create Format class and assign BP Format to it

Compile and test a Hello DataMan example

Run and tested helloWriter under examples/hello/writer
Fixed Makefile

Added example/hello/dataman with API examples
Changed mpidummy.h due to an error in Titan compilation with g++

This version compiles. 
Tested with 2 write APIs:

under examples/hello/singleBP
helloSingleBP.cpp -> using ADIOS single manager class from ADIOS.h
helloSingleBP.cpp -> using ADIOS objects from ADIOS_OO.h

both generate a .bp file using a POSIX transport

To do:
Test compilation in other platforms/compilers
Add coverage test cases
Add the NULL transport (does nothing)
Work on SingleBP engine to generate bp format
XML config file support (to be defined)