Fixed #68: Implement SheerkaQL

Fixed #70: SheerkaFilterManager : Pipe functions
Fixed #71: SheerkaFilterManager : filter_objects
Fixed #75: SheerkaMemory: Enhance memory() to use the filtering capabilities
Fixed #76: SheerkaEvaluateConcept: Concepts that modify the state of the system must not be evaluated during question

src/sheerkaql/SheerkaQueryLangage.py

@@ -0,0 +1,26 @@
+from sheerkaql.lexer import Lexer
+from sheerkaql.parser import Parser
+
+lexer_instance = Lexer()
+
+
+class SheerkaQueryLanguage:
+
+    def compile(self, query):
+        """
+        Compiles a query string into a python function that takes one parameter, the execution namespace.
+        The compiled function is re-usable. For information on the grammar see X.
+        """
+        return Parser().parse(bytes(query, 'utf-8').decode('unicode_escape'), lexer=lexer_instance)
+
+    def execute(self, query, namespace, allow_builtins=False):
+        """"
+        Compiles the query string and executes it with the supplied namespace. If you want to execute a
+        particular query many times, use compile to get a query function.
+        :param query: query to execute (from  self.compile())
+        :param namespace: execution's namespace
+        :param allow_builtins: auto add builtin functions and names
+        """
+        if allow_builtins:
+            namespace.update(__builtins__)
+        return self.compile(query)(namespace)