Merge pull request #5 from orlandobcrra/master

improvement to get values ​​from 'map' fields
release 0.1.6
updated version to 0.1.6 in manual
fixed Property Type Validation not accepting subclasses
upgrade to 2.2.4 and release 3.0.0
fix for MissingMethodException when upgrading to grails 2.3.1 (because of changes in groovy). Release 0.1.8
update to README
update to README, improving readability
Update README.md
Merge pull request #10 from Niggler/patch-1

Update README.md
Update README.md

Apache license boilerplate added
update to release plugin 3.0.1
updated readme to 0.1.9 release
Code highlighting in README.md
Merge pull request #12 from stokito/patch-1

Code highlighting in README.md
release plugin dependency downgraded to 2.2.1, so it is easy to use in grails < 2.3
Adds multiple-sheet manipulation w/o breaking existing API and keeping existing ability-based DSL
Adds the worksheetName property to XlsxExporter, allowing you to change the initial worksheet's name
Formalized a static prop definition like its original, downgrades Grails version
Adds support for raw Maps