Added unit tests showing that GC'ed SoftReferences are not cleanup from memoize caches
Fixed cache's SoftReferences instantiation in order to register them in a ReferenceQueue
GROOVY-6068: Thread safety issue in AntBuilder leads to major memory leak
GROOVY-5964: Upgrade gradle to 1.5
GROOVY-6068: Thread safety issue in AntBuilder leads to major memory leak
GROOVY-6070: concatenation with NodeChildren object fails
GROOVY-4794: enum constant initializer parsing
GROOVY-4485: enum does not support default map constructors
minor refactor - better use of EmptyStatement.INSTANCE
minor tweaks to GroovyConsole
GROOVY-6054: context variable breaks output transformation
GROOVY-4485: enum does not support default map constructors (minor refactor)
GROOVY-6075: Support for generation of 1.6 and 1.7 bytecode
GROOVY-6072: "String | []" is converted to a ClassExpression at semantic analysis
GROOVY-6078: Null safe navigation broken with maps/lists in CompileStatic mode
GROOVY-6061: Subscript assignment not working if the RHS is a VariableSlotLoader
GROOVY-4485: enum does not support default map constructors (minor refactor - delay implicit map constructor addition until a later phase to minimise interactions with other AST transforms)
GROOVY-6082: GroovyResultSet not updateable for Prepared Statements
Merge pull request #128 from luque/memoize-cleanupcache-bugfix

[GROOVY-5948]  memoizeAtLeast and memoizeBetween don't cleanup garbage-collected SoftReferences
deactivated tests because they are successful only sometimes on the build server