Custom protocol handler test page added.

Custom protocol handler test page added.

Custom protocol handlers' origin must have 'http' or 'https'
protocol and the site registering the custom handler must be
of the same origin as this handler. This implies, that the
test page's origin must have 'http' or 'https' protocol, so
we hosted this test page on GitHub:
  http://jmajnert.github.io/tests/customProtocols/
and modified tests to use it.

Bug: http://107.108.218.239/bugzilla/show_bug.cgi?id=9522
Reviewed by: Antonio Gomes, Min-Soo Koo, Piotr Tworek, commitbot

Change-Id: I5bfc9ff681f1bdfde1131af6d25f88c42bc92235
Signed-off-by: Filip Piechocki <f.piechocki@samsung.com>