Updated for url correction and zlib error

I was unable to use the gem because of following errors:

1. The url seems to require a space before key param
2. Zlib::GzipFile::Error: not in gzip format : compression error when trying to get all users

have corrected for both of these errors by:

1. correcting url by inserting psace(%20)before key param in the url
2. removing gzip