Merge pull request #4 from oxpa/master

diskStats function and mib has precalculated data added
Merge pull request #5 from oxpa/master

Measurement timestamp added, "floating point gauges" are now octet strings.
versions updated
function forks experimental feature implemented ( use_fork ), switched off by default
systemd service unit added to startup subagent-shell on systems where systemd enabled (rhel/centos 7)
installation of startup script removed from make file
spec file modified for rhel/centos 7
ntp clock check implemented in perl due to strange(slow response) behaviour of ntpdate
minor fixes
minor fix
string comparison minor fix
httpResponseMIB function provides all values for all groups in regular expression
version updated

Conflicts:

	RPM/SPECS/net-snmp-subagent-shell.spec
version updated