[PR] LoaderTest::testsEvents() fails on windows



This PR addresses an issue in Phalcon\Loader.

Affected function is Phalcon\Loader::getCheckedPath() which returns invalid path on windows in some cases.
To reproduce this issue just run LoaderTest::testsEvents() on windows. See attached screenshot for result

![loadertest-testevents](https://f.cloud.github.com/assets/2228236/1609104/c5a208a0-552d-11e3-85d3-f28bc4e67025.png)

The problem is in function **phalcon_fix_path()** where a conditional statement incorrectly assumes that
 if a trailing path separator from users was specified it'll always be the same as system path separator. 

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This PR was tested on

- Windows 7 x64, PHP 5.5.3 x86, Phalcon 1.3.0 x86
- Ubuntu 13.10, PHP 5.5.3 x86, Phalcon 1.3.0 x86