let expressions #747
Merge branch 'master' into let

Conflicts:
	Ceylon.g
fix spans for if expressions, fixing IDE bugs #503
Merge branch 'master' into let

Conflicts:
	Ceylon.g
fix scope of specifier expression in let variables #747
Merge branch 'master' into let

Conflicts:
	src/com/redhat/ceylon/compiler/typechecker/analyzer/ExpressionVisitor.java
Merge branch 'master' into let
clarify something for @lucaswerkmeister
Merge branch 'let'