Adds Short Tag Information to Readme

Adds short tag information to readme and methods to enable short tags on
development server. Also, indicates that issue has been discussed.
Removed exception when jobs dir doesn't exist

Can't think of a reason this should fail when the dir doesn't exist -- just don't list anything.
Use case: I like to remove empty top-level directories from my sites, so that I can quickly see at a glance what I've actually overridden. If there's no /jobs directory, the dashboard jobs page should just assume there are no jobs in that location and move on checking the other locations (instead of halting the entire process).
typo

as mentioned here http://www.concrete5.org/developers/bugs/5-6-0-2/typo/
typo in uninstall package screen

as mentioned here http://www.concrete5.org/developers/bugs/5-6-0-2/typo-in-uninstall-package-page/
avoid conversion of short tag to long tag

http://www.concrete5.org/developers/bugs/5-6-0-2/generated-sitemap-incorrect/
another badly converted short tag
Update web/concrete/js/tiny_mce/plugins/spellchecker/classes/GoogleSpell.php
allow svg file uploads

http://www.concrete5.org/developers/bugs/5-6-0-2/svg-images-in-file-manager/
removed sort parameter in array_unique

I'm not sure if this is correct but I couldn't see why we need that second parameter in array_unique.
Discussion: http://www.concrete5.org/index.php?cID=405968&editmode=
fixed phpdoc comments in JSON helper (no code change)
fixing minor XSS in composer image cropper
Remove comyright comment from ccm.app.js

The file /web/concrete/js/ccm.app.js is built by /build/js.sh by
merging uncompressed .js files and compressing them with uglify-js.
The resulting ccm.app.js contains the copyright info from the first .js
file (which may vary depending on the build order).
I propose to remove that comment...

I think there are no problems with the authors of the original js files
since concrete5 is distributed with the compressed ccm.app.js AND with
the original files.
Merge pull request #751 from mlocati/remove-js-comments

Remove copyright comment from ccm.app.js
removed copyright from javascript
Merge pull request #736 from jordanlev/patch-9

fixed phpdoc comments in JSON helper
Merge pull request #725 from Remo/patch-29

allow svg file uploads
Merge pull request #714 from Remo/patch-23

avoid conversion of short tag to long tag
Merge pull request #693 from Remo/patch-19

typo in uninstall package screen
Merge pull request #649 from mkly/readme_short_tags

Adds Short Tag Information to Readme
Merge pull request #730 from Remo/patch-31

removed sort parameter in array_unique