Fixed proxy config and error hanlding

• Correcctly implemented proxy-handling, #6.
• Improved error handling, #5

Allow enabling/disabling curl, code optimizations

• #3 Allows curl to be enabled or disabled using JsonRPCClient->enableCurl() or JsonRPCClient->disableCurl(). Many thanks to @sitawit (Sitawit Suteepohnwiroj)
• #4 Code optimization. Many thanks to Jeroen de Haas

PSR2 comaptible source, improved debugging

2.2.0

Merge branch 'master'

Fixed composer support

• Renamed class files to fix composer support;
• issue #2 is now closed

Composer support

• Add root namespace on Exception class; thanks to @Cyrille37 for #1
• restructured and added composer.json to solve #2

Refactored release

Version 2.0

This release includes the following improvements upon the original code:

• Support for newer PHP versions
• Name-spaces are supported
• Performance has been improved
• NULL and FALSE return values are now handled correctly
• Allow to throw exceptions
• Improved the in-line documentation
• Re-formatted code