ipfixcol: added simple socket library (libsiso)
ipfixcol: fixed double free
ipfixcol: added JSON storage plugin
json storage plugin added to configure and makefile
Default visibility for symbols is changed to hidden.
refs #1974
Merge branch 'json'
Merge branch 'master' of homeproj.cesnet.cz:/var/reps/git/ipfixcol

Conflicts:
	base/configure.ac