Bump version number to 0.6.2-dev
Fix a bug and inconsistency in Piq syntax

- [ (.foo) ] was incorrectly expanded to []
- [ (.foo) 1 ] would have been incorrectly expanded to [ .foo 1 ]
Allow wrapping arbitrary Piq syntax elements in parenthesis

This is rarely useful, but consistent with already supported "indentity" forms
such as (.foo) that are used for controlling associativity.
Add initial Piq parser tests
Start using "master" as a development branch
Merge branch 'dev'
Remove Piqi for Erlang -- it was moved to a new location

Development of piqi-erlang has permanently moved to
https://github.com/alavrik/piqi-erlang
More dev -> master renamings in doc/* urls
piqi-0.6.3 release
Bump version number to 0.6.3-dev