Add increaseIndentPattern/decreaseIndentPattern settings (#46)

* Add increaseIndentPattern/decreaseIndentPattern settings

* Address feedback

* Fix the decreaseIndentPattern

Author: timfjord

preferences/Indentation Rules.tmPreferences

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<plist version="1.0">
+<dict>
+  <key>scope</key>
+  <string>source.elixir</string>
+  <key>settings</key>
+  <dict>
+    <key>decreaseIndentPattern</key>
+    <string>^\s*([\}\]\)]\s*$|(after|else|catch|rescue|end)\b)</string>
+    <key>increaseIndentPattern</key>
+    <string>^\s*(after|else|catch|rescue|^.*(do|&lt;-|-&gt;|[\{\[\(]))\s*$</string>
+  </dict>
+</dict>
+</plist>