* Initial checkin. Supports -name, -name -print and a subset of -type

Has unit tests, but no system tests

* Corrected usage text

* Added ability to replace stdout with a fake. Moved and_matcher to
logical_matchers

* Significant refactoring to allow tests for the arg-parsing code

* Added tests for the argument parsing code.

* Added support for or operator

* Added change missing form last commit

* Added AUTHORS and (MIT) LICENSE

* Added support for lists (i.e. the comma operand)

* Added support for parentheses

* Cleaned up names of some Or/And/List matcher methods

* Added support for depth-first searching

* Added initial support for max_depth, min_depth and depth arguments.

* Cleaned up a surfeit of Box::new's and change the [Or|And|List]Matchers
to use builders, so submatchers can't be added later on.

* Added support for -a

* Added support for prune

* Added prune

* Refactored the way we fake stdoutput.

Will allowing for easy expansion for stderr, clocks etc.

* Renamed side effects to matcherio

* Removed leftover tracing println call

* Tidied up use statements

* Switched to using walkdir

* Added support for -newer

* renamed new_sideeffetcs to new_matcher_io

* Implemented ctime, atime and mtime

* merged name_matcher and caseless_name_matcher into one module

* Added support for -size

* Minor tweaks based on code review

* Switched Config struct to implement Default

* Replaced try! with ?

* Added copyright headers