Properly indent StringIO examples
Remove unecessary return checks from comprehensions
Fix typo in Maps, add 2 examples to docs
Merge pull request #2076 from knewter/minor_maps_doc_updates

Fix typo in Maps, add 2 examples to docs
Ensure structs can be used on pattern matching
Improve docs for EEx
Ensure we only print a map as a struct if the keys match
Ensure we properly convert !(foo > bar) to strings
Update CHANGELOG
Add a __struct__ field on defstruct and ensure proper message on struct body access
Add `:only` dep option to filter on environments

mix deps.get will by default fetch all deps unless --only flag is given.