Adjusted namespaces of reference tests to fit logical structure
Implement -Verbose common parameter for cmdlets.
Merge pull request #267 from sburnicki/reftest_namespaces

Adjusted namespaces of reference tests to fit logical structure
Conversion from null and to bool
 Assignment with arithmetic operators use same code as operations
Merge pull request #271 from sburnicki/null_conversion

Conversion from null and to bool
Merge pull request #272 from sburnicki/assignments_with_arith_ops

 Assignment with arithmetic operators
adding support for `-notmatch` regex operator.

...helps with issue #274
Adding case-sensitive regex operators.

 ...helps with issue #274
adding case sensitive equality comparision for strings.

 ...helps with issue #274
adding support for case-sensitive not-equals operator

 ...helps with issue #274
Merge pull request #276 from Pash-Project/otherOperatorSupport

Other operator support
Correct '-not' and 'git stash pop' support
Better bool conversion, tests by language reference
Corrected typo
Merge pull request #277 from sburnicki/not_op

Not operators, improved conversion to bool
Enabled tests that pass now.
Merge pull request #278 from ygra/enable-tests

Enabled tests that pass by now.
Added support for conversion to string according to spec.
Used ConvertTo instead of casts for string conversion.