Implemented Terminal.prototype.fit

Implemented fit method for Terminal objects, which:
  - Fits the terminal's columns to its parent element width
  - Fits the terminal's rows to its parent element height

src/xterm.js

@@ -2712,9 +2712,38 @@ Terminal.prototype.resize = function(x, y) {
 
   this.normal = null;
   
-  this.emit('resize', {terminal: this, columns: x, rows: y});
+  this.emit('resize', {terminal: this, cols: x, rows: y});
 };
 
+/*
+*  Fit terminal columns and rows to the dimensions of its
+*  DOM element.
+*
+*  Approach:
+*    - Rows: Truncate the division of the terminal parent element height
+*            by the terminal row height
+*
+*    - Columns: Truncate the division of the terminal parent element width by
+*               the terminal character width (apply display: inline at the
+*               terminal row and truncate its width with the current number
+*               of columns)
+*/
+Terminal.prototype.fit = function () {
+  var container = this.element.parentElement,
+      subjectRow = this.element.firstElementChild,
+      rows = parseInt(container.offsetHeight / subjectRow.offsetHeight),
+      characterWidth,
+      cols;
+  
+  subjectRow.style.display = 'inline';
+  characterWidth = parseInt(subjectRow.offsetWidth / this.cols);
+  subjectRow.style.display = '';
+  
+  cols = parseInt(container.offsetWidth / characterWidth);
+      
+  this.resize(cols, rows);
+}
+
 Terminal.prototype.updateRange = function(y) {
   if (y < this.refreshStart) this.refreshStart = y;
   if (y > this.refreshEnd) this.refreshEnd = y;