Update irulehttp.tcl

mocks for HTTP::headers evaluation if available instead of stub execution
Update on.tcl

separated reading of expectation from supporting unknown statements
Update on.tcl

fixed return code propagation from expected to unknown proc
Update it.tcl

removed dependency on HTTP::header in reset_expectations proc
in jTcl expansion substitution is not available (jTcl is compatible with Tcl 8.4, expansion substitution was introduced in Tcl 8.5)
test and example execution scripts for Windows
Merge branch 'master' of github.com:Sebastian-Brzuzek/TesTcl into Sebastian-Brzuzek-master