gauge_specs_dir should be added to the default properties on init

[sswaroopgupta]

Current behavior
It is not added to the project, internally it is defaulted to specs

This property is currently not discoverable by the user. If gauge_specs_dir = specs is already present in the default property file, it will be more disoverable

Version

Gauge version: 0.9.9.nightly-2018-05-24
Commit Hash: 2150e31

Related to issue getgauge/gauge-vscode#222

[nehashri]

Added to all templates, online and offline installation.
Should be available in gauge >= 30-5-18.