Removed bootstrap package as a dependency

For issue #13
Re-added twitter bootstrap as a submodule

issue #13
Improved test script so it will work on osx
Update src/less/bootstrap-datetimepicker.less

Increase z-index so it could be put into modal window (not behind it)
Merge pull request #14 from ysilvestrov/patch-1

Update src/less/bootstrap-datetimepicker.less
Merge branch 'master' of git://github.com/tarruda/bootstrap-datetimepicker