First major code push

Preparing for version 0.1.0
Contains a real README, the test framework, and the API implementation

client.go

@@ -0,0 +1,92 @@
+package groupme
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"io/ioutil"
+	"net/http"
+)
+
+// Endpoints are added on to the GroupMeAPIBase to get the full URI.
+// Overridable for testing
+const GroupMeAPIBase = "https://api.groupme.com/v3"
+
+// Client communicates with the GroupMe API to perform actions
+// on the basic types, i.e. Listing, Creating, Destroying
+type Client struct {
+	httpClient         *http.Client
+	endpointBase       string
+	authorizationToken string
+}
+
+// NewClient creates a new GroupMe API Client
+func NewClient(authToken string) *Client {
+	return &Client{
+		httpClient:         new(http.Client),
+		endpointBase:       GroupMeAPIBase,
+		authorizationToken: authToken,
+	}
+}
+
+// Close safely shuts down the Client
+func (c *Client) Close() error {
+	c.httpClient.CloseIdleConnections()
+	return nil
+}
+
+// String returns a json formatted string
+func (c Client) String() string {
+	return marshal(&c)
+}
+
+///// Handle parsing of nested interface type response /////
+type jsonResponse struct {
+	Response response `json:"response"`
+	Meta     `json:"meta"`
+}
+
+func newJSONResponse(i interface{}) *jsonResponse {
+	return &jsonResponse{Response: response{i}}
+}
+
+type response struct {
+	i interface{}
+}
+
+func (r response) UnmarshalJSON(bs []byte) error {
+	return json.NewDecoder(bytes.NewBuffer(bs)).Decode(r.i)
+}
+
+func (c Client) do(req *http.Request, i interface{}) error {
+	getResp, err := c.httpClient.Do(req)
+	if err != nil {
+		return err
+	}
+
+	// Check Status Code is 1XX or 2XX
+	if getResp.StatusCode/100 > 2 {
+		return errors.New(getResp.Status)
+	}
+
+	bytes, err := ioutil.ReadAll(getResp.Body)
+	if err != nil {
+		return err
+	}
+
+	if i == nil {
+		return nil
+	}
+
+	resp := newJSONResponse(i)
+	if err := json.Unmarshal(bytes, &resp); err != nil {
+		return err
+	}
+
+	// Check Status Code is 1XX or 2XX
+	if resp.Meta.Code/100 > 2 {
+		return &resp.Meta
+	}
+
+	return nil
+}