Fixed E_STRICT errors,add support for lang options

Applied fix to handle errors surfacing when error reporting level is set to E_STRICT (Creating default object from empty value)
Added support for lang configuration options. 
Update Highcharts version to 3.0
Merge branch 'master' of https://github.com/destinydriven/cakephp-high-charts-plugin
Updated README.markdown
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Updated Highcharts product name
Removed duplicated line
Fixed error caused due to setting of tooltipFormatter

Setting of tooltipFormatter casued other tooltip settings to set to null
because new HighRollerToolTip was instantiated.
Also added plotoptions for PieData Labels
Merge pull request #8 from chandanpansare/master

Fixed error caused due to setting of tooltipFormatter
Update HighChartsComponent.php

Fixes issue where yAxisTitle options overwrites other yAxis options
Update HighChartsComponent.php

Added credits option
Merge pull request #10 from kieranbarnes/master

Update HighChartsComponent.php
Added support
Modified 'exportingEnabled' condition to facilitate better checking in HighChartsHelper

Helps ensure that exporting.js is only loaded in the view when 'exportingEnabled' is set to TRUE in chartParams.
Extra Legend Options
Merge pull request #13 from kieranbarnes/master

Extra Legend Options
Update HighChartsComponent.php

Adding yAxisTickInterval & yAxisMinTickInterval
Merge pull request #15 from kieranbarnes/master

Adding yAxisTickInterval & yAxisMinTickInterval
Fixed issue with column drilldown
Fix issue with tooltipFormatter.

Fixes bug "creating default object from empty value" thanks to @hellsend.
Replace static CakeSession call with instance

From CakePHP version 2.5 Sessions will not be started if they are known to be empty. If the session cookie cannot be found, a session will not be started until a write operation is done.
http://book.cakephp.org/2.0/en/appendices/2-5-migration-guide.html#cakesession