Replaced tuple<bool,string,string> with named struct in chisel.cpp.

This change fixes compilation with GCC 4.4 and improves readability of
code.
Removed unused includes.
Travis uses GCC 4.4 as well
Merge pull request #139 from annulen/no_tuple

Replaced tuple<bool,string,string> with named struct in chisel.cpp
added zlib to the manual visual studio project
make sure that formatting fields are evaluated even if a previous one is rejected
fix compiler warning
typo was preventing the right description
new filter field: proc.duration
compile error under windows
new chisel: proc_exec_time
make sure the proc_exec_time resets the text color when exiting
Added scsallslower script
cleanup the output of the -i flag
Merge pull request #140 from pradeepchhetri/master

Added scallslower script
validate the value passed to the evt.type filter field
crash when passing a non existent argument to evt.arg and evt.rawarg
cleanup
Add fix for install OpenVZ kernel headers correctly
Make sysdig-probe kernel module work with kernel 3.15.0