Bug 1093929 - Improve grunt tasks and add additional options

nit: replaced nogit with unknown

Fixed nits and update README

Fixed dev server value in config.js

Fixed review comments

Add build folder to .gitignore

Addressed review comments
Bug 1082517 - Remove ensureGUM call before opening the attention screen
Merge pull request #288 from dcoloma/grunt-changes

Bug 1093929 - Improve grunt tasks and add additional options r=jaoo
Bug 1099023 - [Loop] First Loop call shows the call status bar on bottom
Merge pull request #304 from AntonioMA/bug1082517

Bug 1082517 - Remove ensureGUM call before opening the attention screen
Merge pull request #306 from crdlc/bug-1099023

Bug 1099023 - [Loop] First Loop call shows the call status bar on bottom
Bug 1098339 - Telemetry report automation
Bug 1098407 - Need to adapt FxOS Loop client to send the MCC of the caller (follow up bug 1039444). r=borjasalguero
Merge pull request #305 from ferjm/bug1098407.mccfollowup

Bug 1098407 - Need to adapt FxOS Loop client to send the MCC of the call...
Merge pull request #307 from mcjimenez/bug1098339

Bug 1098339 - Telemetry report automation ( r = frsela)
Bug 1098346 - Incoming call registered in call log with MCC, when outgoing call is without MCC
Merge pull request #303 from crdlc/bug-1098346

Bug 1098346 - Incoming call registered in call log with MCC, when outgoi...
Bug 1097665 - Implement toolbar in the main screen to create rooms and/or start conversations
Merge pull request #309 from crdlc/bug-1097665

Bug 1097665 - Implement toolbar in the main screen to create rooms and/o...