Enable skip-non-vietnamese by default

This nice feature should be enabled by default.
implement mouse click detection, fix issue #15
update install doc and deb package with new dependency: python3-xlib
Merge branch 'master' into upd

Conflicts:
	ibus_engine/ibus_engine.py
Distribute python3-xlib along with ibus-bogo-python source code
to avoid trouble with distributions
update install doc, cmakelists to reflect the change
remove python3-xlib dependency in deb package
Enforce relative import, thus avoid troubles related to linux distributions and python-xlib
Fix import path for local python-xlib
Rename MouseDetect -> MouseDetector class and PEP8 clean up
Refactor, Fix subthread not exiting
Refactor MouseDetector; properly implement observer pattern
Merge pull request #2 from lewtds/cleanup-mouse-detector

Refactor MouseDetector; properly implement observer pattern
fix forget to start
Fix thread hanging issue
use the trick recipe from http://code.activestate.com/recipes/496960/ to solve the problem of thread not exiting
it's exiting!
Make MouseDetector a daemon thread so that it exits automatically
Merge pull request #3 from lewtds/daemon-thread

Make MouseDetector a daemon thread so that it exits automatically
Merge pull request #115 from 'phaikawl/master' into develop
Merge remote-tracking branch 'origin/develop' into develop
Merge branch 'master' into develop
Move bogo engine-specific tests to bogo/test
Move charset tests into vncharsets/test