Added a useful Curry Iso example.
Found an example giving an NPE.
Fix initialization order causing an NPE in IsoSyntax. #54
Add a bit of documentation for Curry.
Add an interesting String<->Int prism modify example.
Merge pull request #59 from NightRa/Examples

Enrich the example base.
Merge branch 'master' of https://github.com/julien-truffaut/Monocle into 55-lens-example-in-readme