Changed git:// to https:// to allow for updates on cloned machine seemlessly + Updated documentation
Merge pull request #32 from fenekku/doc

Changed git:// to https:// to allow for updates on cloned machine + Documentation
Simplify some tracking test function names
Add tracked files to git index
Remove superflous $FORCE check when tracking
Don't check whether file exists when adding to git index
Fix bug with '-e' flag in linux
Replaced version comparison function

Fix for OSX error message:

    expr: not a decimal number: '1'
Readlink and realpath doesn’t exists and/or has different argument flags

In OSX readlink has different arguments and realpath doesn’t exists.
These commands where being used to determine the absolute physical path
of a file. It is not necessary to use these commands to do this. Instead
a abs_path function has been created that uses pwd, basename and
dirname.
Merge pull request #33 from wesclemens/master

Missing commands in OSX
Add some links to the TOC
Auto-download of shunit2 when running tests
Fix logging bug when `symlink` creates a directory
Fixed missing dot in documentation (my bad)