Fix atom.sh when running from directory with space

Deal with ATOM_PATH having a space by proper quoting, and not passing
the directory name to dirname.

Fixes atom/atom#4336
Move Debian alternatives entry up.

Move the Debian alternatives entry up so it's below and grouped with
"no such file or directory" since it's an alternate solution to symlinking.
Call Workspace::getActiveTextEditor, not ::getActiveEditor
:arrow_up: exception-reporting@0.21
:arrow_up: git-diff@0.44
:arrow_up: status-bar@0.49.0

For deprecation fixes

Signed-off-by: Nathan Sobo <nathan@github.com>
Upgrade find-and-replace to fix tabbing between mini editors
:arrow_up: tabs
:arrow_up: command-palette

For deprecation fixes.

Signed-off-by: Nathan Sobo <nathan@github.com>
Update notifications to add repro steps to issue body
:arrow_up: package-generator@0.33
:arrow_up: language-sass@0.27
:arrow_up: status-bar@0.50.0
add Slackware install method
:arrow_up: apm@0.111.1
Prepare 0.154
:arrow_up: language-less@0.20
:arrow_up: language-python@0.25
Allow setting editor text content in HTML
Merge pull request #4406 from atom/mb-editor-text-content

Allow setting editor text content in HTML