Add docs for x-labels.

Fixed a small issue where labels which have more than one characters
will disappear.

README.md

@@ -84,7 +84,7 @@ self.clockChart.data = @[
 
 ![Bar Chart](http://i.imgur.com/ScJksKh.png)
 
-Just a bar chart, no label, no interaction, no animation.
+Just a bar chart, no interaction, no animation.
 
 ```objective-c
 #import "TEAChart.h"
@@ -107,6 +107,12 @@ barChart.data = @[@2, @7, @1, @8, @2, @8];
 [self.view addSubview:barChart];
 ```
 
+To add x-labels to the bar chart, set ``xLabels`` property. Should be just one character per label since the bars are narrow.
+
+```objective-c
+barChart.xLabels = @[@"A", @"B", @"C", @"D", @"E", @"F"];
+```
+
 ## Installation
 
 Use CocoaPods:

TEAChart/TEABarChart.m

@@ -63,7 +63,7 @@ - (void)drawRect:(CGRect)rect
             NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc]init] ;
             paragraphStyle.alignment = NSTextAlignmentCenter;
 
-            [label drawInRect:CGRectMake(idx * (barWidth + self.barSpacing), barMaxHeight + labelsTopMargin, barWidth, barWidth)
+            [label drawInRect:CGRectMake(idx * (barWidth + self.barSpacing), barMaxHeight + labelsTopMargin, barWidth, fontSize * 1.2)
                withAttributes:@{
                                 NSFontAttributeName:[UIFont fontWithName:@"HelveticaNeue" size:fontSize],
                                 NSForegroundColorAttributeName:[UIColor colorWithWhite:0.56 alpha:1],