fix(preprocessor): calculate sha1 on content returned from a preprocessor

Fixes #1204
docs: fix small grammar error in ember example
Merge pull request #1211 from jonbretman/docs-ember-grammar-fix

docs: fix small grammar error in ember example
fix(runner): Fix typo in CSS class name for .idle

Fix a typo in the CSS class name applied to the runner web page
in state idle, so the HTML markup and CSS now match.
Merge pull request #1224 from mjul/fix-css-typo

Fixed a typo in a the CSS class name for .idle
fix: add emscripten memory image as binary suffix

Emscripten generates binary files with a .mem suffix which
are used to initialize static data. This change makes Karma
treat such files as binary, and hence not preprocess them.
Merge pull request #1230 from 0u812/emscripten-mem-fix

Treat emscripten memory images as binary
chore(deps): connect@2.26.0
Merge pull request #1198 from harrison/update-connect-dep

chore(deps): connect@2.26.0
Replace 'Enter empty string' with 'Press Enter'

Keeps consistency of "Press <button>" instructions. Also, dispels confusion of potentially entering an empty string, ' ' , when the user simply has to press enter.
Merge pull request #1237 from ceg1236/patch-1

docs(config): Replace 'Enter empty string' with 'Press Enter'
Merge branch 'pr-1210' into presubmit-master-pr-1210
chore: release v0.12.25
fix(browser): don't add already active socket again on reconnect

Current behaviour: few 'register' messages from the same socket will lead to crash on disconnect
After fix: next 'register' messages from the same socket will be skipped