Bug 1026005 - Pre: Allow testing with |mvn integration-test|.

This avoids errors like:

W dalvikvm(24082)             Class resolved by unexpected DEX: Lorg/mozilla/gecko/fxa/AccountLoader;(0x42c13358):0x75440000 ref [Landroid/support/v4/content/AsyncTaskLoader;] Landroid/support/v4/content/AsyncTaskLoader;(0x42c13358):0x74a71000
W dalvikvm(24082)             (Lorg/mozilla/gecko/fxa/AccountLoader; had used a different Landroid/support/v4/content/AsyncTaskLoader; during pre-verification)
W dalvikvm(24082)             Unable to resolve superclass of Lorg/mozilla/gecko/fxa/AccountLoader; (247)
W dalvikvm(24082)             Link of class 'Lorg/mozilla/gecko/fxa/AccountLoader;' failed
E dalvikvm(24082)             Could not find class 'org.mozilla.gecko.fxa.AccountLoader', referenced from method org.mozilla.gecko.background.fxa.TestAccountLoader.testInitialLoad
W dalvikvm(24082)             VFY: unable to resolve new-instance 1299 (Lorg/mozilla/gecko/fxa/AccountLoader;) in Lorg/mozilla/gecko/background/fxa/TestAccountLoader;
D dalvikvm(24082)             VFY: replacing opcode 0x22 at 0x0005
W dalvikvm(24082)             Class resolved by unexpected DEX: Lorg/mozilla/gecko/fxa/AccountLoader;(0x42c13358):0x75440000 ref [Landroid/support/v4/content/AsyncTaskLoader;] Landroid/support/v4/content/AsyncTaskLoader;(0x42c13358):0x74a71000
W dalvikvm(24082)             (Lorg/mozilla/gecko/fxa/AccountLoader; had used a different Landroid/support/v4/content/AsyncTaskLoader; during pre-verification)
W dalvikvm(24082)             Unable to resolve superclass of Lorg/mozilla/gecko/fxa/AccountLoader; (247)
W dalvikvm(24082)             Link of class 'Lorg/mozilla/gecko/fxa/AccountLoader;' failed
D dalvikvm(24082)             DexOpt: unable to opt direct call 0x1df8 at 0x07 in Lorg/mozilla/gecko/background/fxa/TestAccountLoader;.testInitialLoad
I TestRunner(24082)           started: testInitialLoad(org.mozilla.gecko.background.fxa.TestAccountLoader)
I TestRunner(24082)           failed: testInitialLoad(org.mozilla.gecko.background.fxa.TestAccountLoader)
I TestRunner(24082)           ----- begin exception -----
I TestRunner(24082)
I TestRunner(24082)           java.lang.NoClassDefFoundError: org.mozilla.gecko.fxa.AccountLoader
I TestRunner(24082)           	at org.mozilla.gecko.background.fxa.TestAccountLoader.testInitialLoad(TestAccountLoader.java:145)
I TestRunner(24082)           	at java.lang.reflect.Method.invokeNative(Native Method)
I TestRunner(24082)           	at java.lang.reflect.Method.invoke(Method.java:525)
I TestRunner(24082)           	at android.test.InstrumentationTestCase.runMethod(InstrumentationTestCase.java:214)
I TestRunner(24082)           	at android.test.InstrumentationTestCase.runTest(InstrumentationTestCase.java:199)
I TestRunner(24082)           	at android.test.ActivityInstrumentationTestCase2.runTest(ActivityInstrumentationTestCase2.java:192)
I TestRunner(24082)           	at junit.framework.TestCase.runBare(TestCase.java:134)
I TestRunner(24082)           	at junit.framework.TestResult$1.protect(TestResult.java:115)
I TestRunner(24082)           	at junit.framework.TestResult.runProtected(TestResult.java:133)
I TestRunner(24082)           	at junit.framework.TestResult.run(TestResult.java:118)
I TestRunner(24082)           	at junit.framework.TestCase.run(TestCase.java:124)
I TestRunner(24082)           	at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:191)
I TestRunner(24082)           	at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:176)
I TestRunner(24082)           	at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:554)
I TestRunner(24082)           	at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1738)
I TestRunner(24082)           ----- end exception -----
I TestRunner(24082)           finished: testInitialLoad(org.mozilla.gecko.background.fxa.TestAccountLoader)
Bug 1026005 - Part 1: Add and broadcast ACCOUNT_STATE_CHANGED_ACTION.
Bug 1026005 - Part 2: Add AccountLoader.
Bug 1026005 - Review comments.