HTML: Restructure html folder

This changes the HTML part of GitX to be more consistent -- we
now use a "views" directory where every web view has it's own
directory.

Furthermore, GitX-wide Javascript is added in the "lib" directory.
The same is true for CSS in the "css" directory. Every view can
have its own custom CSS and JS, and those are put in the views
directory (without JS or CSS prefix directories).

html/css/diff.css

@@ -0,0 +1,54 @@
+body {
+	margin: 0;
+	margin-top: 5px;
+	width: 100%;
+}
+code .delline, code .oldfile {
+  background-color: #FEE;
+  color: #B00;
+}
+
+code .addline, code .newfile {
+  background-color: #DFD;
+  color: #080;
+}
+code .fileline {
+  font-weight: bold;
+}
+
+code .hunkheader {
+  background-color: #f7f7f7;
+  color: #bbb;
+}
+
+pre {
+  width: 100%;
+}
+
+pre code {
+  width: 100%;
+}
+
+#CurrentHunk {
+	border-left: 5px solid black;
+}
+
+.whitespace {
+	background-color: rgba(255,0,0,0.5);
+}
+
+
+table.diff {
+	margin-top: 15px;
+	margin-left: 5px;
+	margin-right: 5px;
+	border-spacing: 0;
+}
+.lineno {
+	padding-left: 2px;
+	padding-right: 2px;
+	background-color: #ECECEC;
+	color: #A9A9A9;
+	border: 1px solid #DDDDDD;
+	text-align: right;
+}