Fixed comparing major version number in conditional comments matcher

Fixed matching expression like: `if IE 5`. According to [MSDN](http://msdn.microsoft.com/en-us/library/ms537512%28v=vs.85%29.aspx#Version_Vectors):

> In the following example, only the major version number is specified; therefore, the sample evaluates as true for both Internet Explorer 5 and Internet Explorer 5.5.