clarify basic configuration example and nginx versions compatibility to close...

clarify basic configuration example and nginx versions compatibility to close #145 and fix clone url to close #135

Co-Authored by: Roman Kuzmin <romanoza@gmail.com>
Signed-off-by: Wandenberg <wandenberg@gmail.com>

README.textile

@@ -27,6 +27,12 @@ This module is considered production ready.
 h1(#basic-configuration). Basic Configuration
 
 <pre>
+    # add the push_stream_shared_memory_size to your http context
+    http {
+       push_stream_shared_memory_size 32M;
+
+        # define publisher and subscriber endpoints in your server context
+        server {
            location /channels-stats {
                 # activate channels statistics mode for this location
                 push_stream_channels_statistics;
@@ -50,6 +56,8 @@ h1(#basic-configuration). Basic Configuration
                 # positional channel path
                 push_stream_channels_path                   $1;
             }
+        }
+    }
 </pre>
 
 
@@ -156,10 +164,10 @@ h1(#installation). Installation <a name="installation" href="#">&nbsp;</a>
 
 <pre>
     # clone the project
-    git clone http://github.com/wandenberg/nginx-push-stream-module.git
+    git clone https://github.com/wandenberg/nginx-push-stream-module.git
     NGINX_PUSH_STREAM_MODULE_PATH=$PWD/nginx-push-stream-module
 
-    # get desired nginx version (works with 1.5.x, 1.4.x, 1.3.x, 1.2.x series)
+    # get desired nginx version (works with 1.2.0+)
     wget http://nginx.org/download/nginx-1.2.0.tar.gz
 
     # unpack, configure and build