Update M2E P2 repository URL

To workaround bug 407797 [1], main M2E P2 repository does not
reference M2E 1.3.x and earlier versions any more. The old versions
are still available but need to be installed using version-specific
repository URL [2].

[1] https://bugs.eclipse.org/bugs/show_bug.cgi?id=407797
[2] http://wiki.eclipse.org/M2E_updatesite_and_gittags#m2e_releases
Add support for Eclipse Kepler as a target platform

[1] http://www.eclipse.org/kepler/
Reduce amount of build logs

Ubuntu package updates are rarely cause problems, so we don't need all
these details on what's going on during update.
Merge pull request #161 from manandbytes/travis-ci

[releng] Introduce support for Eclipse Kepler
Assert parent project has no errors too
Don't catch errors when removing test projects
Remove unused instance of IWorkspaceRoot
Drop tearDown() from MultiModulePluginTest

Rely on org.eclipse.m2e.tests.common.AbstractMavenProjectTestCase's
tearDown() implementation instead. That will remove all our test
projects too, don't waste time waiting for deleteAndroidProject() to
complete.

Remove now unused AndroidMavenPluginTestCase's deleteAndroidProject(String).
Drop AndroidMavenPluginTestCase's deleteAndroidProject(IProject)
Don't remove projects manually

Rely on org.eclipse.m2e.tests.common.AbstractMavenProjectTestCase's
tearDown() implementation instead. That will remove all our test
projects too, don't waste time waiting for deleteAndroidProject() to
complete.
Drop AndroidMavenPluginTestCase's waitForAndroidJobsToComplete()

Rely on parent's waitForJobsToComplete() and don't hide exceptions if
there are any.
Merge pull request #163 from manandbytes/let-them-throw

Rely on AbstractMavenProjectTestCase as much as possible