Merge pull request #168 from piwik/translationupdates

[automatic translation update] Updated 443 strings in 6 languages (ca, de, el, fi, it, nl)
Fix loading/Done! text not showing in geolocation settings w/ morpheus.
Show disabled radio buttons/checkboxes with grey background color in morpheus.
refs #4280 created a travis.yml that allows plugin developers to run their tests on travis
Piwik 2.0 is here. Wow!
Adding to README the travis icon for the screenshot tests build
This modifies jqPlot to support retina displays.

fixes #4389
fixes #4373, #1640
this way we will get at least the actual error message. Fix there are 2 constructors defined in some PHP versions (log() and __construct())
Merge branch 'master' of github.com:piwik/piwik
rename class Filter -> BaseFilter to prevent error "two constructors are defined on PHP 5.3.2"
rename methods to prevent error "two constructors are defined on PHP 5.3.2"
fix Declaration of UIAssetCacheBusterMock::piwikVersionBasedCacheBuster() should be compatible with Piwik\AssetManager\UIAssetCacheBuster::piwikVersionBasedCacheBuster($pluginNames = false)
updated composer.lock as there is new jshrink lib
fix core tests
refs #4393 all websites appears in another line
refs #4393 reports added to the scheduled reports do not appear as checked. still looking for a better solution
fixes #4386 fix datepicker is not completely visible. I wanted to fix this in JS but unfortunately the beforeShow event of the datepicker is not working and I did not find any other workaround. So fixing it this way
make sure log class is loaded
Merge pull request #169 from piwik/fix-retina

Modify jqPlot to support retina displays.