Remove last vestige of Marionette.$ to fix #1406

Running `grep -rn 'Marionette\.\$' .` in the root of the project now
only returns matches in the changelog and the currently existing build
in lib/core.
Cleaned up destroyingViews spec
Merge pull request #1421 from cmaher/fix-1406

Fix 1406
Cleaned up getOption spec
Cleaned up mixinUnderscoreCollection spec
Merge pull request #1424 from thejameskyle/cleanup-destroyingViews

Cleaned up destroyingViews spec
Cleaned up normalizeMethods spec
Cleaned up onDomRefresh spec
Cleaned up precompiledTemplateRendering spec
Merge pull request #1427 from thejameskyle/cleanup-normalizeMethods

Cleaned up normalizeMethods spec
Merge pull request #1429 from thejameskyle/cleanup-precompiledTemplateRendering

Cleaned up precompiledTemplateRendering spec
Merge pull request #1428 from thejameskyle/cleanup-onDomRefresh

Cleaned up onDomRefresh spec
Merge pull request #1426 from thejameskyle/cleanup-mixinUnderscoreCollection

Cleaned up mixinUnderscoreCollection spec
Cleaned up requestResponse spec
Cleaned up templateCache spec
Cleaned up renderer spec
Merge pull request #1431 from thejameskyle/cleanup-renderer

Cleaned up renderer spec
Merge pull request #1433 from thejameskyle/cleanup-templateCache

Cleaned up templateCache spec
Merge pull request #1432 from thejameskyle/cleanup-requestResponse

Cleaned up requestResponse spec
Merge pull request #1425 from thejameskyle/cleanup-getOption

Cleaned up getOption spec