Merge branch 'release/1.5.2' into develop

* release/1.5.2:
  JSlint mgUtil.js
  Inteligent use of the isReady function
  Bumping version
Change popup default icon
Changed footer
Deleted html background page

We were only using the html page to load js scripts.
Deleting silly console.log
Fix unchanging icon

Regresion introduced with commit 22f78c672ea83e49165fc991a9ae2328b23ebdfe
Corrected image extension
JSLint of bookmark.js
Fix #72

Be aware that there is another bug of prettyphoto that don't correctly get
the image url, trying to use instead the window.location.
Reorder the inclution of the css and js files
Fix valMg being undefined
Asseting issue #73

There is a prettyPhoto issue here. It doesn't get the correct url for the
image. I posted for help in their forums but seems almost dead.
@AllMangasReader-dev Look for lines 93, 202 and 750 of the prettyPhoto
library.
Removed releases notes related files

fixes #53
Fixes #74

@AllMangasReader-dev Can anyone check the createScan() changes. I couldn't
figure out where that is triggered. Or I just didnt have scans bookmarked
-_-
Changing vendor specific css rule for generic one
Partial fix of issue #77

The scrollbar don't seems to be moving along. This shall be reviewed.
Cleaning comments
Added a method to use the search function from the url

Now calling search.html?s=value will launch a search of the value string.
Merge branch 'feature/search' into develop

* feature/search:
  Added a method to use the search function from the url
  Cleaning comments
Added a function to search from the context menu any selected text

Please note that this don't work if the text to search isn't selected.