RELEASE: v0.2.4
FIX: Add utils.format.toISOString() to help side-step possible "Invalid Date"
RELEASE: v0.2.5
NEW: Add boost query
NEW: Support Edismax query
FIX: Encode boost queries
NEW: Test and document edismax() and boost().
RELEASE: v0.2.6
Merge branch 'master' into gh-pages
FIX: Update doc for version v0.2.6
FIX: Update contributors section.