Convert tests to casper API (bug 1045707)

Make screenshot when test fails

Add LC_ALL=en-US to casperjs command

Remove xvfb as this was for phantom < 1.5

Put casper into package.json

Fix syntax nits

Remove callback as we're not using it.

Use simpler globbing thanks @cvan

Fix README
Merge pull request #556 from muffinresearch/casperjs-1.1

Convert tests to casper API (bug 1045707)
Added date checking to fireplace (bug 1044230)
Add flow test for system date error dialogue (bug 1044230)
Merge pull request #561 from muffinresearch/robs-date-branch

Add system date check to Fireplace (bug 1044230)
preemptively add feed assets for verbatim (bug 1052703)
add new rocket placeholder icon
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fix l10n in package (bug 1055295)
focus login window on open (bug 1055391)
Merge pull request #575 from dethe/bring_login_front

focus login window on open (bug 1055391)