Templates for issues and pull requests added

Author: Afonso Gloeden

.github/ISSUE_TEMPLATE.md

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+## Versions
+
+  * Laravel: Run `php artisan --version` to show the version.
+  * PHP: Run `php --version` to show the version.
+  * Composer: Run `composer --version` to show the version.
+  * uepg/laravel-sybase: Get the version in `composer.lock`.
+
+## Expected behavior
+
+What should have happened? Please include as much detail as possible.
+
+## Actual behavior
+
+What actually happened? Please include as much detail as possible.
+
+## Steps to reproduce
+
+1. Step 1
+1. Step 2
+1. Step 3

.github/PULL_REQUEST_TEMPLATE.md

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+## Changes
+
+  * Feature 1
+  * Feature 2
+  * Change 1
+  * Change 2
+  * Change 3
+  * Deletion 1
+  * Fix #123
+  * ...