Add a function for expecting a panic. (#6)

Merge pull request #5 from liquidgecka/dont_panic

Make sure that Interface() is not called on private values.

Merge pull request #4 from liquidgecka/equal_should_be_equal

Ensure that equality on unicode chars works.

TryUntilf test addition, coverage back to 100%

Merge pull request #3 from liquidgecka/error_success_f

Rename NotEqual* 2nd param want → unwanted

Round out the Foo*f functions

ExpectSuccessf and ExpectErrorf variants

Merge pull request #2 from liquidgecka/minor_updates

Fixes the have/want names in Equal.

Add a Equals function that allows ignoring of some fields.

Golang messed with govet again, make travis build

Fix a bug in README.md (reported by Phil Pennock)