Custom folder for local Cache DB

[bezkos]

I did a small tweak so we can have custom folder for local cache DB.

`
class RandomUserAgentMiddleware(object):
def init(self, crawler):
super(RandomUserAgentMiddleware, self).init()

    loc = crawler.settings.get('LOCATION')
    if loc is None: 
        self.ua = UserAgent()		    
    else:
        self.ua = UserAgent(path=crawler.settings.get('LOCATION'))        
    self.per_proxy = crawler.settings.get('RANDOM_UA_PER_PROXY', False)        
    self.proxy2ua = {}`

In settings file, u can have an option like:
LOCATION = '/home/user/fake_useragent%s.json' % fake_useragent.VERSION

[alecxe]

@bezkos good idea, thanks!