Deleted unused build scripts.

OfficeWeb/build/build.bat

-@echo off
-cd /D %~dp0
-
-@echo on
-call grunt.cmd --no-color
\ No newline at end of file

OfficeWeb/build/installtools.bat

-@echo off
-cd /D %~dp0
-
-SET GRUNT_OLD=grunt@0.3.17
-SET GRUNT_CLI=grunt-cli
-
-echo Check is there old grunt installed.
-call npm list -g %GRUNT_OLD% && call npm uninstall -g grunt
-
-echo Installation grunt-cli
-call npm list -g %GRUNT_CLI% || call npm install -g %GRUNT_CLI%
-
-call npm install