Minor refactoring.
Fixes issue #276: Enable Response::sendFile() to operate on resources
moved HttpException to web.
Adjusted parameter order.
typo: primarykey -> primaryKey
added note about usage to StringHelper::basename()
removed unnecessary defaul value from Response
API consistency in Response class

use `getIs...` instead of `is...` to allow these methods to be used as
virtual properties.

This is forconsistency to the rest of the framework.
Only methods that take parameters may be named `is...`.
fixed usage of renamed method in Response
Merge pull request #524 from cebe/response-api-getter

API consistency in Response class
Update Schema.php
Merge pull request #526 from sergon/patch-3

pgsql schema findColumns fix