Remove global reset in favour of contextual reset.

Rather than having a partial reset with individual elements having
their styles built back up, only elements without replacement
styles have specific properties 'reset'.

This commit also includes: a correction to the font mixin arguments
used on forms (the output is now valid CSS); the removal of
`overflow-y:scroll` from the `html` element which is now known to
cause some problems for jQuery modal plugins in Firefox.

lib/tables.less

@@ -4,6 +4,15 @@
 // ----------------------------------------
 
 
+// BASE TABLES
+// -----------------
+
+table {
+  max-width: 100%;
+  border-collapse: collapse;
+  border-spacing: 0;
+}
+
 // BASELINE STYLES
 // ---------------