Issue in sending different size messages

[Ehsan Aerabi]

When client sends several fixed-size values (like 64 bytes) everything seems OK.

But suppose client sends an 8-byte message like this: "ABCDEFGH". Next time it tries shorter message like this: "xyz".

learners would receive second message like this: "xyzDEFGH".

[Daniele Sciascia]

Fix sending and printing of values in sample client/learner/replica

See #4

→ <<cset 59096b2eaba6>>

[Daniele Sciascia]

Merge branch 'dev'

Closes #4

→ <<cset d255f8b67a32>>