Assert: Drop 'assertion' from short descriptions

Having 'assertion' in each description doesn't read well and isn't necessary
anyway, since the context should be obivious enough.
Config: Document hidepassed property

Fixes gh-25
Closes gh-41
Config: Add scrolltop docs

Ref jquery/qunit#414
Config: Document urlConfig options

Ref jquery/qunit#385
Closes gh-42
Throws: Update siganture

The expected parameter is optional and supports more types than Error

Fixes gh-31
Closes gh-39
1.14.0
Categories: Remove references to bundled addons
Categories: Add description for configuration category

Ref gh-44
1.14.1