Make sure excluded user agent textarea displayed when adding a new site to Manage > Websites is only displayed when option to use site specific exclusion criteria is set.

 * when changing website in the selector, the segment parameter will be reset (to no segment).

refs #3612

I'm using Meld on Ubuntu to compare processed VS expected files. slightly updating README to clarifying workflow.

Fixing couple small bugs

 * you can now write browserCode==ff;referrerKeyword!= to select all visitors using firefox and that have a keyword set
 * or you can write referrerKeyword==;browserCode==ff to select all visitors using firefox and that did not have any keyword set
Also fixes #3933

Refs #2135
 * fixing last bugs with segment selector encoding (working on chrome + FF + opera) - I 'hope' it will work on iE...

 * NAILED the encoding! wow that was tough for my brain, but finally got around it.

 Some findings:
 _GET is automatically URL decoded
 QUERY_STRING contains raw URL so we'll use this one instead
 I REALLY want to simplify the whole "_GET" variables within Piwik so that all code uses a static method to get input variables. Refs #3931

 * Fixing some encoding issues and many small bugs
 * When user is anonymous, show message inviting user to login to try the feature

  * Multi-Row evolution + Limit selector "10/50/100/500"  now works as expected

fixes #3926 thanks for the suggestion, fixing Piwik core to allow several translations whether the period is used in the sentence or standalone

Updated doc at: http://piwik.org/docs/tracking-api/reference/
 and http://piwik.org/docs/page-speed/

refs #3913 Fixes API for dashboards + disabling Dashboard API tests for now

Adding future look ahead window to the SQL trying to detect the current visitor
+ fixing small bug discovered (in the tests) as a result of this fix

Using standard example domains rather than other websites. Thanks Ronald Volgers for the suggestion!

HTTP status codes should be a page scope custom variable.

# The bug experienced here is a "test edge case" bug quite tricky to find (couldnt find it or reproduce it, need to setup phpenv properly)
# -> out of reach for my priorities at this stage (single task focus is my new reality). Will come back to fix this bug in June when things should be in control

Refs #3913 adding XML files so the build passes, but tests output is empty for now. Also moving to private unused methods (lets delete any unused method)

automatic translation update