Updating command for importing key

Bumping version to 0.8.3

Fixed typo.

Adding log messages for multithreading getgauge#492

Updating go-check, fsnotify, lumberjack dependencies in godeps

create zip after installation, getgauge#565

Bumping version to 0.7.0

Splitting runner start func to smaller functions

Check if its a gauge project before init

If gauge --init is done in a existing gauge project dir, it exits with a
proper message.
To verify if its a Gauge project or not, Gauge looks for manifest.json
in current dir and also checks if field `Langauge` is set.

Ref getgauge#412

prep for release 0.6.0.