Update check_erb_syntax to use check-rails-erb
Update check_erb_syntax to use check-rails-erb

Rails 3 introduced new ERB syntax, breaking our existing
check_erb_syntax. This switches the check to use an in-repo
bin/check-rails-erb script which uses Rails 3's own ERB parser.

Change-Id: Iaa92f646cfd220730646a9c25c61ce37d497436d
Reviewed-on: https://gerrit.causes.com/5004
Tested-by: Lann Martin <564fa7a717c51b612962ea128f146981a0e99d90@causes.com>
Reviewed-by: R Pickett <3182b54d9f4d08641b5a9a0fb33f74df5d76b222@causes.com>

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