Make request instance to select CachePolicy.

[huntrax11]

First of all I wanna thank you for sharing this great request library-
In your EGOHTTPRequest method called "- (NSURLRequest_)buildURLRequest"
There are code like above that declare CachePolicy.
NSMutableURLRequest request = [[NSMutableURLRequest alloc] initWithURL:self.url
cachePolicy:NSURLRequestReturnCacheDataElseLoad
timeoutInterval:self.timeoutInterval];
Some times I need to specify cache policy on request when User want to update manually and blah blah blah.
Would you like to make a fix on that?