Merge pull request thiagoelg#7 from thiagoelg/electron7

Electron7 fix

0.5.1 release

Update version

Release builds (thiagoelg#5)

* Scripts to build releases

* Fix windows release script

Release builds (thiagoelg#5)

* Scripts to build releases

* Fix windows release script

Fixing appveyor electron build (thiagoelg#3)

README: specific distribution build, as advised in tojocky#125