Collection class was changed to be a simple interface

InMomoryPerProcess class was added to be used where the old Collection
was used.

headers/modsecurity/collection/variable.h

@@ -0,0 +1,47 @@
+/*
+ * ModSecurity, http://www.modsecurity.org/
+ * Copyright (c) 2015 Trustwave Holdings, Inc. (http://www.trustwave.com/)
+ *
+ * You may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * If any of the files related to licensing are missing or if you have any
+ * other questions related to licensing please contact Trustwave Holdings, Inc.
+ * directly using the email address security@modsecurity.org.
+ *
+ */
+
+
+#ifdef __cplusplus
+#include <string>
+#endif
+
+
+#ifndef HEADERS_MODSECURITY_TRANSACTION_VARIABLE_H_
+#define HEADERS_MODSECURITY_TRANSACTION_VARIABLE_H_
+
+
+#ifndef __cplusplus
+typedef struct Variable_t Variable;
+#endif
+
+#ifdef __cplusplus
+namespace modsecurity {
+namespace collection {
+
+class Variable {
+ public:
+     Variable(const std::string& key, const std::string& value) :
+        m_key(key),
+        m_value(value) { }
+     std::string m_key;
+     std::string m_value;
+};
+
+}  // namespace collection
+}  // namespace modsecurity
+#endif
+
+#endif  // HEADERS_MODSECURITY_TRANSACTION_VARIABLE_H_