issue with checkTemplate and sub-includes #155

I'm not sure how localized this is, but I was running into an issue where a template in a sub-directory including another template from another sub-directory (both share the same parent directory) was causing the calling template's sub-directory to be appended to the base-path before the file_exists check.

Example:

Directory Structure:

./view
../handlebars
.../handlebarsTemplate.tpl

../modals
.../modal.tpl

../pdf
.../pdf.tpl

../widgets
.../widget.tpl

../file1.tpl
../file2.tpl
../etc....tpl

Let's say file1.tpl includes ./view/modals/modal.tpl and modal.tpl includes the handlebarsTemplate.tpl.

When Rain::checkTemplate runs for handlebarsTemplate.tpl the value passed is modals\handlebarsTemplate.tpl

And then the following code runs (..\Rain\Tpl.php:227-232):

// set filename
$templateName = basename($template);
$templateBasedir = strpos($template, DIRECTORY_SEPARATOR) ? dirname($template) . DIRECTORY_SEPARATOR : null;
$templateDirectory = null;
$templateFilepath = null;
$parsedTemplateFilepath = null;

The culprit here seems to be the ternary on Line 229 $templateBasedir = strpos($template, DIRECTORY_SEPARATOR) ? dirname($template) . DIRECTORY_SEPARATOR : null; which, when used in the foreach which immediately follows, causes some templates not to be found because it's checking for the included file in a sub-directory having the name of the including file's parent directory inside of the included file's sub-directory.

From what I could tell, the following 2 lines can be removed from ..\Rain\Tpl.php with no adverse affects:

Line: 229

$templateBasedir = strpos($template, DIRECTORY_SEPARATOR) ? dirname($template) . DIRECTORY_SEPARATOR : null;

Line 242:

$templateDirectory .= $templateBasedir;

My local copy is working fine without this currently, I would contribute a pull request, but I'm not certain I'm not just doing something wrong, or that the changes won't have unintended effects elsewhere in other use cases/situations.

At the very least, commenting out line 242 fixes my current issue.