Make Instant.From{Ticks,Milliseconds,Seconds}SinceUnixEpoch() public.
Make Instant.From{Ticks,Milliseconds,Seconds}SinceUnixEpoch() public.

Given issue 142 and revision 0ec3e1c9c02f, I'm assuming that this was
always intended to be the case.

malcolmr/nodatime,malcolmr/nodatime,BenJenkinson/nodatime,jskeet/nodatime,zaccharles/nodatime,nodatime/nodatime,jskeet/nodatime,zaccharles/nodatime,nodatime/nodatime,zaccharles/nodatime,malcolmr/nodatime,zaccharles/nodatime,zaccharles/nodatime,zaccharles/nodatime,BenJenkinson/nodatime,malcolmr/nodatime