Start on Slim template support
Handle if statements in Slim views
Tests for assignments in if statements
Fewer `or` expressions created in if expressions

when doing assignments
Avoid some sexp creation
Fix processing of production.rb in Rails 3

fixes #264
Merge pull request #265 from presidentbeef/fix_processing_production_rb

Fix processing of production.rb in Rails 3
Merge branch 'master' into fix_multiple_assignments_in_if_statements
Add tests for prepend/append_before_filter
Handle prepend/append_before_filter
Scroll errors into view when showing/hiding
Add tests for more skip_before_filters
More checks for skipping important before_filters

using :except instead of :only
Expand Haml dependency to 4.x

closes #263
More fixes for operations on or expressions
AliasProcessor#set_value cleanup
[Slim] Ignore output of output variables
[Slim] look for @output_buffer.safe_concat

because I forgot the order template processing happens
[Slim] Don't ignore string interps, we need later
Start on Slim template tests