Fix build errors, update to latest bootstrap 3.

It seems that the git submodule for bootstrap pointed to old boostrap 2.3.* and
"@import variables" had an invalid path. Updated to latest boostrap 3.0.3 and
fixed the path. Also commiting updated dist files.
Fix build process, fix #92, fix css compression.

- CSS was not minified, fixed the param for lessc.
- Add build.less which now imports variables from bootstrap and is used for building dist files.
- bootstrap-datepicker.less can now be imported from userland and will not throw errors.
- Updated dist files to latest versions.
- Added compilation of the un-minified version to Makefile.
Merge pull request #93 from Thinkscape/hotfix/92

Fix build errors, update bootstrap, fix CSS compression, fix #92.