fix(plugin:printer): fix isAvailable function + promise for print function
chore(jslint): cleanup jslint errors + smaller fixes
fix(test): printer plugin
chore(bower+npm): update to v0.1.7-alpha
update README.md

added AdMob to the list of plugins
Delete v0.1.4-alpha
Delete v0.1.5-alpha
Delete v0.1.7-alpha
Delete v0.1.6-alpha
Merge pull request #420 from Dharmoslap/readme

Added AdMob to README.md