fixes #26, also check for non app store variant of JPEGmini bundle id
add error messages to env config
1.4.5
README
Merge branch 'develop' into issue-24

* develop:
  README
  1.4.5
  add error messages to env config
  fixes #26, also check for non app store variant of JPEGmini bundle id

Conflicts:
	bin/imageOptim
	environment/base.json
	src/shell/methods.sh
applied fix for #26
read from stdin rather than have a --file option