remove doc of former versions

googlemock/docs/v1_5/Documentation.md

-This page lists all documentation wiki pages for Google Mock **version 1.5.0** -- **if you use a different version of Google Mock, please read the documentation for that specific version instead.**
-
-  * [ForDummies](V1_5_ForDummies.md) -- start here if you are new to Google Mock.
-  * [CheatSheet](V1_5_CheatSheet.md) -- a quick reference.
-  * [CookBook](V1_5_CookBook.md) -- recipes for doing various tasks using Google Mock.
-  * [FrequentlyAskedQuestions](V1_5_FrequentlyAskedQuestions.md) -- check here before asking a question on the mailing list.
-
-To contribute code to Google Mock, read:
-
-  * DevGuide -- read this _before_ writing your first patch.
-  * [Pump Manual](http://code.google.com/p/googletest/wiki/PumpManual) -- how we generate some of Google Mock's source files.
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googlemock/docs/v1_6/Documentation.md

-This page lists all documentation wiki pages for Google Mock **1.6**
-- **if you use a released version of Google Mock, please read the documentation for that specific version instead.**
-
-  * [ForDummies](V1_6_ForDummies.md) -- start here if you are new to Google Mock.
-  * [CheatSheet](V1_6_CheatSheet.md) -- a quick reference.
-  * [CookBook](V1_6_CookBook.md) -- recipes for doing various tasks using Google Mock.
-  * [FrequentlyAskedQuestions](V1_6_FrequentlyAskedQuestions.md) -- check here before asking a question on the mailing list.
-
-To contribute code to Google Mock, read:
-
-  * [DevGuide](DevGuide.md) -- read this _before_ writing your first patch.
-  * [Pump Manual](http://code.google.com/p/googletest/wiki/V1_6_PumpManual) -- how we generate some of Google Mock's source files.
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googlemock/docs/v1_7/Documentation.md

-This page lists all documentation wiki pages for Google Mock **(the SVN trunk version)**
-- **if you use a released version of Google Mock, please read the documentation for that specific version instead.**
-
-  * [ForDummies](V1_7_ForDummies.md) -- start here if you are new to Google Mock.
-  * [CheatSheet](V1_7_CheatSheet.md) -- a quick reference.
-  * [CookBook](V1_7_CookBook.md) -- recipes for doing various tasks using Google Mock.
-  * [FrequentlyAskedQuestions](V1_7_FrequentlyAskedQuestions.md) -- check here before asking a question on the mailing list.
-
-To contribute code to Google Mock, read:
-
-  * [DevGuide](DevGuide.md) -- read this _before_ writing your first patch.
-  * [Pump Manual](http://code.google.com/p/googletest/wiki/PumpManual) -- how we generate some of Google Mock's source files.
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