Strip query and hash from path when creating asset name

[jahredhope]

When choosing an asset name attempt to strip out query and hash from the path.

This change attempts to fix
#113
and may relate to
#109

When initially cloning the repo tests were failing, this may be due to my Node version (v8.4.0) or other environmental factors. However I was unable to fix the broken tests.

Failing Tests

compression
      1) generates the expected HTML files
legacy-args
      2) generates the expected HTML files
require-ensure
      3) generates the expected HTML files

[coveralls]

Coverage remained the same at 100.0% when pulling 312870a on jahredhope:master into 09001fe on markdalgleish:master.

[coveralls]

Coverage remained the same at 100.0% when pulling 8e7ccdb on jahredhope:master into 09001fe on markdalgleish:master.

[jahredhope]

Closed in favour of #140