Added 'Locator Should Match X Times' keyword similar and more generic version of 'Xpath Should Match X Times' keyword and test.
doc updates related to loglevels and logging
fixes #253
fix JavaScript kw doc
log level trace not supported
Merge pull request #320 from ombre42/misc-doc

Misc doc updates
Moved 'Locator Should Match X Times' acceptance test.

Moved test from test/acceptance/keywords/elements.txt to
test/acceptance/keywords/content_assertions.txt.
Merge pull request #298 from emanlove/locator-x-times

Added new keyword 'Locator Should Match X Times'