Fix API path definitions

Fixes sumoheavy#291

Declares `path` for API GET calls using not `issue.self` (which produces full URIs) but `client.options[:rest_base_path]`

Resulting API calls will not have repeated URIs which are raising `request_client.rb:16:in `request': JIRA::HTTPError`

Works For Me (TM)

lib/jira/resource/remotelink.rb

@@ -18,6 +18,7 @@ def self.all(client, options = {})
         end
 
         path = "#{issue.self}/#{endpoint_name}"
+        path = client.options[:rest_base_path] + "/#{endpoint_name}"
         response = client.get(path)
         json = parse_json(response.body)
         json.map do |link|

lib/jira/resource/transition.rb

@@ -20,7 +20,7 @@ def self.all(client, options = {})
           raise ArgumentError.new("parent issue is required")
         end
 
-        path = "#{issue.self}/#{endpoint_name}?expand=transitions.fields"
+        path = client.options[:rest_base_path] + "/issue/#{issue.key}/#{endpoint_name}?expand=transitions.fields"
         response = client.get(path)
         json = parse_json(response.body)
         json['transitions'].map do |transition|

lib/jira/resource/watcher.rb

@@ -19,7 +19,7 @@ def self.all(client, options = {})
           raise ArgumentError.new("parent issue is required")
         end
 
-        path = "#{issue.self}/#{endpoint_name}"
+        path = client.options[:rest_base_path] + "/#{endpoint_name}"
         response = client.get(path)
         json = parse_json(response.body)
         json['watchers'].map do |watcher|