Add enqueue event to protocol and connection

fixes #381
Blacklist unsupported connection flags

closes #881
docs: update badges
Make only column names enumerable in RowDataPacket

closes #549
fixes #895
Support Node.js 0.6

closes #718
deps: istanbul@0.3.2
deps: bignumber.js@1.4.1
Remove underscore from devDependencies
Add code POOL_ENQUEUELIMIT to error reaching queueLimit
Add enqueue event to pool

closes #716
docs: move connection event location