Update and rename build/CMakeLists.txt to CMakeLists.txt

Moving CMakeLists.txt to root so that the cmake code generator can generate the eclipse files correctly. Without this change the eclipse was not showing the source and header files correctly.
Update README.md

Merging the build instruction in readme.
Updating the required Boost version to 1.54.0
Updating the required cmake version to 2.8.0
Also added the instructions for the cmake generators that are specified by the -G cmd line arg.
Update README.md

Removing the redundant "-b develop" cmd line arg.
Removing the build_instructions.md file as these instructions now have
been merged in the Readme.md.
Merge pull request #5 from zarianw/develop