Update document for the develpers as per current implementation

docs/en_US/build_code_snippet.py

@@ -0,0 +1,71 @@
+import os
+import sys
+import inspect
+
+root = os.path.realpath(
+        os.path.dirname(
+            os.path.realpath(__file__)
+            ) + '{0}..{0}..{0}web'.format(os.sep)
+        )
+
+if sys.path[0] != root:
+    sys.path.insert(0, root)
+
+from pgadmin.utils import PgAdminModule
+
+target = open('code-snippet.rst', 'w')
+target.truncate()
+
+target.write("Code Snippet\n")
+target.write("------------\n\n")
+target.write("""
+This document contains code for some of the important classes, listed as
+below:\n\n""")
+
+for m in [
+        'PgAdminModule', 'NodeView',
+        'BaseDriver', 'BaseConnection'
+        ]:
+    target.write("* {0}_\n".format(m))
+
+def print_code(outstream, name, module, info=None):
+    l = len(name)
+
+    outstream.write("\n\n.. _{0}:\n\n{0}\n".format(name))
+
+    idx = 0
+    while idx < l:
+        idx += 1
+        outstream.write("*")
+
+    if info:
+        outstream.write("\n\n{0}".format(info))
+
+    outstream.write("\n\n.. code-block:: python\n\n")
+
+    for line in inspect.getsourcelines(module)[0]:
+        if line.strip():
+            outstream.write("    {0}".format(line))
+        else:
+            outstream.write("{0}".format(line))
+
+
+print_code(
+        target, "PgAdminModule", PgAdminModule,
+        """
+PgAdminModule is inherted from Flask.Blueprint module.
+This module defines a set of methods, properties and attributes, that every module should implement.
+""")
+
+from pgadmin.browser.utils import NodeView
+print_code(
+        target, "NodeView", NodeView,
+        """
+NodeView class helps exposing basic REST APIs for different operations used by
+pgAdmin Browser. The basic idea has been taken from the `Flask's MethodView
+<http://flask.pocoo.org/docs/0.10/api/#flask.views.MethodView>`_ class. Because
+- we need a lot more operations (not, just CRUD), we can not use it directly.""")
+
+from pgadmin.utils.driver.abstract import BaseDriver, BaseConnection
+print_code(target, "BaseDriver", BaseDriver)
+print_code(target, "BaseConnection", BaseConnection)