Fixed betterInstanceOf for Gecko

Some tests fail with SlimerJS...

Closes #732
REFS #731 Explicitly added documentation of --verbose option
Merge pull request #733 from laurentj/issue-732

Fixed betterInstanceOf for Gecko
fixes #736 - fixed package.json
updated CONTRIBUTORS
bump 1.1-beta3
fixed version in package.json
added installation instructions through npm
removed deprecated batchbin & rubybin directories
added yet another warning about casper & node
testing docs: fix notes about storing test failures
Merge pull request #739 from kmike/patch-2

testing docs: fix notes about storing test failures