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
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
renames time id to timeSlot to distinguishe from listEvent id with same name
Reuse view rather than inflating a new one when available
Check if reusing a listevent that had a track when event doesn't have one.

/src/org/osuosl/ocw/Schedule.java: Because some events don't have tracks, i.e. "registration", we must check if the view being reused was from an event that does have a track and if so remove the track text.
Added remove filter option to menu
Moved menu items to menu.xml and load from there
Return whether menu was created successfully instead of always true.