[TIMOB-3151] Android: Enable Transactions for Titanium.Database

Android: testDatabaseRollback from Drillbit fails on Android only

Steps to Reproduce:
1. Run Drillbit and execute test Ti.Database tests
2. Select the test to be ran on iOS and Android

Actual Result:
All test pass on iOS
Android Emulator 2.1: fails: testDatabaseRollback false 136 should be: "0", was: "30"

Expected Result:
Should all Pass

Tested with build: Titanium SDK version: 1.7.0 (03/17/11 10:02 630a276)

(from [eba7fd2e0ed9110d701123c5b2917c07bbf86165]) [#3151 state:fixed-in-qa] The failure of the test was caused by the use of the savepoint statement which is not available on devices with API Level 8 (2.1) or lower. I modified the test to check for a failure of savepoint and if it fails not execute the rest of that test. I renamed the test testDatabaseSavepointRollback and added a new simple transaction test, testDatabaseRollback. https://github.com/appcelerator/titanium_mobile/commit/eba7fd2e0ed9110d701123c5b2917c07bbf86165"> https://github.com/appcelerator/titanium_mobile/commit/eba7fd2e0ed9...