add Pattern#expand
Merge branch 'master' into expand
add expand matcher
split up spec/support
expand specs for rails patterns (failing)
commented out specs for when we add expand specs to sinatra patterns
keep ast around
add AST#expand
Merge branch 'master' into expand

Conflicts:
	lib/mustermann/ast.rb
first (slow) version of expand
Revamp AST based patterns.

* Remove compile logic from AST nodes.
* Remove expand logic from AST nodes.
* Add abstract class for implementing Translator pattern.
* Make compiler a translator.
* Make expander a translator.
* Make expanding faaast.
* AST::Parser now converts / into Node::Separator by default.
* Extract pattern validation.
* Add Tree Renderer
* Move AST nodes back into node.rb.
* Start internal api documentation file.

In the future: small commits, please.
improve title
reformat badges in readme
update changes
more documentation
Merge branch 'expand'