Support for all TF builtins

Kindly contributed by @gburiola

Fixes string interpolation function nesting

As described in #26

Indentation settings

Merge pull request #25 from kushmansingh/indentation

Add indentation settings that match terraform fmt

Fixes heredoc bug

See #23

Improved string interpolation support with regex fix

0.12.1

Escape dashes, should fix #22

Improved string interpolation support

Improved string interpolation support - highlighting builtin terrafor…

…m functions e.g. file/replace. Should fix #21

Support heredoc

0.11.0

Add heredoc support - fixes #20

Support HCL file extension

Merge pull request #19 from akarnani/master

Add .hcl as a highlighted file extention

Nested string interpolation

Fixes #18

Optional quotes

0.8.0

Combined screenshots in readme