Ignore compile output and runtime generated files

 - Convert .hgignore to .gitignore

 - Add rules to skip temporary site files used for upload and preview

.gitignore

@@ -0,0 +1,60 @@
+zotonic.pid
+
+erl_crash.dump
+
+*~
+
+ebin/
+
+/deps/mochiweb/doc/
+
+/deps/mochiweb/.eunit/
+
+/src/erlydtl/erlydtl_parser.erl
+
+/src/tests/erlydtl/rendered_output/
+
+/priv/log/
+
+/priv/sasl/
+
+/priv/sites/default/files/
+
+/priv/sites/*/config
+
+/priv/sites/*/files/dropbox/
+
+/priv/sites/*/files/preview/
+
+/priv/sites/*/files/processing/
+
+/priv/sites/*/files/unhandled/
+
+/priv/config
+
+/priv/erlang.config
+
+/priv/modules/
+
+*.orig
+
+zotonic.tmproj
+
+.DS_Store
+
+*.beam
+
+*.o
+
+*.lo
+
+*.la
+
+*.lai
+
+*.so
+
+*.Plo
+
+*.wmtrace
+