Some code refactoring

- Replaced 'shell_exec("curl -s URL")' with PHP5 cURL function
- Replaced state-variables with constants
- Replaced version and program variables with constants
- Bumped version to 0.2

HISTORY

@@ -0,0 +1,7 @@
+0.2 - 2014-07-31
+    Replaced 'shell_exec("curl -s URL")' with PHP cURL function
+    Replaced all state-variables with constants
+    Replaced version and program variables with constants
+
+0.1 - 2014-07-27
+    First release of check_smhiwarn