Allow user to turn morphing off

It's not always morphing time.
refactoring of bool variable `morphingEnabled`
describe `morphingEnabled` property in readme
bumped version number
bumped version number to 0.2.2
Merge branch 'stepanhruda-no-morphing'
bug fix

crash when setText: nil
bug fix

crash when setText:nil
bumped version number to 0.2.3
Merge branch 'itouch2-master'
updated pod in example project
updated changelog and added itouch2 to list of contributors
refactored nil test
moved misplaced line in readme
removed unnecessary version number in changelog
Merge pull request #1 from TomKnig/master

update