More types on ShadowIntent extras.
add getScheme to ShadowIntent
add tests
expose onGoing property of Notification

[Fixes #1255]
add accessor for showWhen field on ShadowNotification

[Fixes #1253]
Robowrapper-related changes

Pom file updated.
Replacing class loader (for project classes reloading) via
RobolectricTestRunner.
R file now loads via AsmInstrumentingClassLoader because it may change
as well as any other project class.
Local temp folder (./tmp/) is used instead of system-default.