Log assert messages

Now, assert messages as visible in the trace output
as well as the line number of condition that failed.
Rename CCScriptSupport::executeAssert -> CCScriptSupport::handleAssert

Also remove the first "cond" argument, since it is always false.
Merge pull request #2391 from sbc100/log_asserts

fixed #2152: Logging assert messages to the console and renaming CCScriptSupport::executeAssert to CCScriptSupport::handleAssert.
Update AUTHORS [ci skip]
Merge branch 'master' into XMLHttpRequest_cchttpclient

# By Sam Clegg (2) and James Chen (1)
# Via James Chen
* master:
  Update AUTHORS [ci skip]
  Rename CCScriptSupport::executeAssert -> CCScriptSupport::handleAssert
  Log assert messages
Some code cleaning