corrected typo in StreetView.js

projCustomURL: was a typo and corrected to proj4CustomURL: as used in line # 175
Merge pull request #170 from friendde/patch-1

corrected typo in StreetView.js
fixes #155
Merge pull request #173 from tmcgee/master

fixes #155
Updated grunt tasks, readme, proxys, and tagged commit as v1.2.0.