Adds 'import project from repository' feature Project tab.

Modifies the Project tab to include an 'import from repository' option.
Includes an ImportTemplateWizard, similar to the ProjectUploadWizard.
Templates are pre-built projects that can include 0 or more
assets, components, and/or blocks to serve as 'scaffolding'
for lessons and tutorials.

Template repositories may be stored in the build/war directory on
the AppEngine server or may be on any reachable web serer. The
repository must be structured in a particular way and use certain
naming conventions.  These rules are described in TemplatesUploadWizard.java.

If templates are stored on a static website. Your webserver must
implement "Cross-origin Resource Sharing (CORS). With Apache you can
do this by using mod_headers placing a .htaccess file in the templates
directory that contains the one line:

  'Header set Access-Control-Allow-Origin "*"'.

External repositories can be added/removed by the user at runtime.

Change-Id: I3b0e8b57d70a9e1b80ed7ce5d6f21248fa130213
WebViewActivity class is actually used by the Twitter component

Change-Id: I957947a7091483180f3355f812dcb074f24f0ca9
Permit Companion to pass values between screens.

Adds support for "open another screen with start value" and "close
screen with value result" in the Companion.

Change-Id: I2fd733c29597a67af48dfb25fe767cd6beea4baa
Changed clock component category from userinterface to sensors.

Change-Id: I5a3b5866b3bf405138eb7b3471dff77da93120f6
Helper script to create new components

Change-Id: Ie35a1d0d55d0290d2d8756b00034feac9e5e4a9a
Fixed TimePicker to show current time by default.

Change-Id: Iaecf879da3ae59980362152c887bbb22d57e7551
Changes in Player component.

  - Added property PlayInForeground
  - Added phonecall interrupt
  - Fixed onResume with playerState

Change-Id: If06bdfec557c882a0fd5509197dec589d05e848c
Adds new events to PhoneCall Component

  - PhoneCallStarted and PhoneCallEnded
  - IncomingCallAnswered

Change-Id: I52940c65b8f7043cec49847e6dbbd3f51c0f7c0d
Update ContactPickers for later versions of Android

Update ContactPicker, EmailAddressPicker and PhoneNumberPicker for
newer Android versions.

Change-Id: Ie129a361d90e59cae52ab3b07327d7348c2318e6
Notifier: change button order to be yes|no|cancel

Change-Id: I8a32fa2923f32ca3408ae3e31ed8ce94b517f434
Fixed DatePicker to show current date by default

Change-Id: I2b91df41a70b9956c7c4c1f2e0d323ae392b84d3
Update Companion Version to 2.20ai2

Change-Id: Id51d42932315a63370840e6a1d96b40a99935f40
Fixed Time and Date pickers, double setting does not occur

Change-Id: I9081c156e616ae0cb47f55a65917555da4958000
Flag switch to invalid screen during development.

This fixes Trac #530. During development you will now get an error
dialog in the blocks editor when you attempt to open a screen that
doesn’t exist.

Change-Id: I23f649f6db77a63e809ddb01325db6feb0ab84fb
Add delay to Sound Play to wait for Sound to load Requires API level >= 8.

Change-Id: I8d5494317645ec05d86438fad2e4322cd313d16c