FIX: Remove unused dependencies.
Try/catch cheerio.load().
NEW: Update jsdom and cheerio to v0.6.5 and v0.12.0
FIX: Replace pseudo class :first by the method .eq(0) which is supported by both jquery and cheerio.

the pseudo class :first is a pseudo class sugar provided by jquery only.
FIX: Check if err is instance of Error, better reporting compared to the assert .isNull().
NEW: Add support for Zepto with jsdom.

Close #20
NEW: Use jquery version 2.0.2 instead of version 1.6.2.
FIX: Remove jquery 1.6.2.
RELEASE: v0.2.0