Incorrect accept header in some blackberry devices:

"text/html,application/xhtml+xml,application/xml,application/x-javascript,*/*;q=0,5"

The "q" comes from device with a ',' instead of '.'.
Merge pull request #77 from mdaguete/incorrect-accept-header

Incorrect accept header in some blackberry devices.
Add eunit test for accept_header_to_media_types
Merge branch 'klm-accept-header-test'