Removed fix width of labels in bio view

/res/layout/bio.xml: Fixed width of labels caused them to create line breaks on high dp devices.
Merge branch 'development' of https://github.com/markholland/ocw-android into bug-14343
Changed px values to dp and sp for text size. Removed hardcoded strings in bio.xml

This allows the app to be better visualised across different screen densities.
Added default string when no affiliation for speaker
changed px to dp and sp in eventdetail.xml
Merge pull request #34 from markholland/bug-14343

Bug 14343