v0.7.2

Merged in performance fix for Guid initializers.
Merged in allowDuplicates option for startScan.
Updated rxdart dependency to the latest (0.24.0).

v0.7.1+1

Merged in fix for constructor platform error when running on emulator.
discoverServices now returns exception when called on a device that's not connected.

v0.7.1

Fixed an issue that caused false notifications when writing characteristics.
Stability improvements when building for iOS.
Add toString to all Bluetooth classes.
Other minor bug/documentation fixes.

v0.7.0

Removed minSdk declaration for Android.
Fixed Android permissions issue causing empty scan results.
Fixed iOS permissions issue that caused build errors.
Various minor fixes to documentation.
Supports v2 android embedding.