cleans the repo
adds the documentation of bibtexbrowser to the Git repository
updates the documentation for correct rendering on Github
adds a word about pull requests on documentation
Fixes a potential cross site scripting (XSS) issue
Merge pull request #16 from arnehaber/clean_xss_fix

Fixes a potential cross site scripting (XSS) issue
Merge pull request #3 from monperrus/master

Rebase