fixed
Add missing semicolon

Missing semicolon was causing an issue in the minified version
A bit of refactoring: removed trailing whitespace and renamed variable to be consistent
Create developer-manual.md
Rename developer-manual.md to CONTRIBUTING.md
Added `setTextLabel` and `setIconLabel` methods
Added the two volpino fixes

Added https://github.com/volpino/bootstrap-switch/commit/ed50d350e45a3bc8b91d6ba0403deed09107bf73

Added https://github.com/volpino/bootstrap-switch/commit/e887adf1d824a805214f090d598a99ee0b2996e8
Removing minified version, solving #135