Merge pull request #307 from zanata/angika-plurals

Add plural forms for Angika
Merge branch 'travis-jdk8' into release
[maven-release-plugin] prepare release server-3.2.1
[maven-release-plugin] prepare for next development iteration
rhbz980670 add ability to upload HTML documents
rhbz980670 update supported formats tooltip to include htm and html
rhbz980670 exclude empty source strings generated by okapi filters
rhbz980670 add template method for okapi adapters to set default params
rhbz980670 prevent whitespace collapse in downloaded HTML documents
rhbz980670 rename GenericOkapiFilterAdapter to OkapiFilterAdapter
rhbz980670 add class to separate translatable part of string from whitespace and tags
rhbz980670 make string cleanup opt-in for okapi adapter subclasses
Screenshot via Test Listener integration

If derived from FunctionalTest, tests will generate screen shots
in the event of before & after click, navigating to a new url, or
test exception.
clean up code a bit
rename class
create test rule for screenshot
will delete screenshot if test fails
unify test screenshot directory location
add screenshot rule to frequent failing test
try to make test more stable