Update old name of submodules in .gitmodules
Lazy loading of tern-auto-complete
Lazy loading of helm
Fixes #46 Weird behavior of projectile

Projectile takes time to load (around 0.2 seconds) and it is
lazy loading friendly if we want to enable it globally.

To be able to lazy load it, we encapsulate the binded calls
in spacemacs/xxx functions which take care of firing the
mode globally if required.