Version 0.1.5

 * Improved "type" for better updates/pull-request
 * Converted variuos variables to (int)
 * removed must-revalidate in header
 * Improved forks
 * Improved http response, If http_status<>200, return error in html2canvas
 * Fixed bug in Facebook redirect (HTTP/1.1 302 forced.302)
 * Fixed bug in "json_encode_string"
 * Improved perfomance in "json_encode_string"
 * Removed unnecessary Etag-header
 * Fixed unseted variables
 * downloadSource always returns array
 * Fixed "invalid escapes" in "json_encode_string"
 * Removed utf8_encode (unecessary)
 * Fixed bug in "relative2absolute"
 * "downloadSource" always returns array
 * Replace "error_get_last" by "get_error"
 * Removed Etag header (it was not necessary)
 * Added coments in functions