Main change - cscope build via Makefile.

* Taking CCTree from hari-rangarajan instead of from vim-scripts.
* Using the term 'Plugin' instead of 'Bundle' (keeping up with updated Vundle)
* Minor white-space changes.
* Modified the command CSC such that it can build the Cscope
    cross-reference file from the Make target defined in
    ../test/Makefile. The normal mode command 'csc' is expected to be
    run either from header files in 'inc' folder or source files in
    'src' folder.