Added action bar

AndroidManifest.xml: Had to change theme to one that inherits from Theme.AppCompat the default matches what was being used previously. Raised minSdkVersion to 8 as this is the lowest given by the support library. Added targetSdkVersion with value of 16. Removed days from menu.
Removed osbridge icon from about
Changed action bar title to WDCNZ to match sampled data.
Changed all px to dp
Updated .apk with action bar
Progress message changes

/src/org/osuosl/ocw/Schedule.java: Loading dialog message text is updated depending on what is being loaded, tracks/speakers/events
Merge branch 'feature-1089' of https://github.com/markholland/ocw-android into development
Added filter by track to menu

/src/org/osuosl/ocw/Schedule.java: a new menu item "filter by track"  is available. upon selecting a dialog is shown with a list of tracks. When a track is selected the event view is filtered to show only events with that track. At the moment leaving this view will destroy it and it won't be present when returning from viewing an events details.
Rough implementation of showing when last updated

Need to make a custom dialog in order to visualise the time nicely.
Added onPrepareDialog to modify last updated text

/src/org/osuosl/ocw/Schedule.java
Added string for last updated dialog

/res/values/strings.xml
Added custom view for last updated dialog
refresh progress dialog text changes depending on what is being loaded
Removed loading text from splash screen
Merge branch 'development' of https://github.com/markholland/ocw-android into enhancement-14853

Conflicts:
	ocw-android.apk