Implements multiple selections clipboard paste

Includes:

  - Passing the selection index in the `Editor::mutateSelectedText`
method callback
  - Storing all the selections content on many calls of
`Selection::copy` with `maintainClipboard = true` in a metadata
`selections` array
  - Handling clipboard with a `selections` metadata in
the`Editor::pasteText` method
:lipstick: Fix typo in pasteText method comments
Adds specs for multi selections clipboard handling
Take version from package.json also when there's no .git directory (source releases)
ignore Thumbs.db in workspace-view and in actual atom gitignore
Visual C++ 2010 should be SP1

else-way there will be "failure during conversion to COFF"
description on StackOverflow: http://stackoverflow.com/questions/10888391/error-link-fatal-error-lnk1123-failure-during-conversion-to-coff-file-inval
Fixed typos
Mention the mkdeb task, closes #1969.
Upgrade reactionary for cleanup / removal of unused 'class' feature
Upgrade to apm 0.51.0
Merge pull request #2006 from Heather/patch-1

Visual C++ 2010 should be SP1
Merge pull request #2013 from pborreli/typos

Fixed typos
Merge pull request #1991 from evinugur/master

ignore Thumbs.db in workspace-view and in actual atom gitignore
Merge pull request #1988 from Ferk/master

Fix for source tarballs error on 'set-version' (not a git repository)
:lipstick: Add variable names for clarity
Upgrade to language-less@0.9.0
Upgrade pathwatcher to support windows builds
Don't use comment lines to determine soft/hard tabs.

Closes atom/language-php#24
Closes #1733
Update README.md

Change 2010 express edition link because old one redirects to a general page about Visual Studio
Upgrade to text-buffer@2.2.1