gui: remove redundant numTransactions tracking

This number was still tracked even though it's shown nowhere in the UI
anymore. It was originally removed because it didn't match the actual number of
records in the view (which contains outputs, not transactions) thus was
confusing people.
replace int with size_t in stream methods

Thus the read(...) and write(...) methods of all stream classes now have identical parameter lists.
This will bring these classes one step closer to a common interface.
addrman: Do not propagate obviously poor addresses onto the network
Fix github-merge with git version 2.1.0

Running git version 2.1.0 on OSX (homebrew), I get
  fatal: '1q': not a non-negative integer

I'm guessing git command-line parsing got more strict recently?
Add bitcoin-tx tests

Testing: delin, delout, locktime, and basic createrawtransaction-like
functionality.
Remove print() from core functions

Break dependency on util.
Move strprintf define to tinyformat.h

This avoids a dependency on util.h if just tinyformat is needed.
Remove link to now removed Windows Build Notes

Removed in
Remove all other print() methods

All unused.
Added protobuf-compiler library to the Qt 5 Dependencies
Update build-osx.md

The homebrew instructions were outdated - berkeley-db4 hasn't worked for months, based on the questions I'm seeing on Google/SO.  So I added a section explaining how to install berkeley-db4 using homebrew and move on with your life.  Thanks for the rest of the documentation!
Merge pull request #4739

de1f051 Added protobuf-compiler library to the Qt 5 Dependencies (elichai)
Merge pull request #4731

c53b1ec Fix github-merge with git version 2.1.0 (Gavin Andresen)
Merge pull request #4706

8695a39 replace int with size_t in stream methods (Kamil Domanski)
Merge pull request #4735

3802224 Remove all other print() methods (Wladimir J. van der Laan)
9b6d4c5 Move strprintf define to tinyformat.h (Wladimir J. van der Laan)
8121258 Remove print() from core functions (Wladimir J. van der Laan)
Merge pull request #4740

b1ed7c2 Update build-osx.md (Rose Toomey)
Merge pull request #4736

5d9f22b Remove link to now removed Windows Build Notes (Michael Ford)
Merge pull request #4733
Build-osx: Force Fix.

Removes the unnecessary directions that encourage people to force install openssl into /usr/local with Homebrew. Unnecessary, and potentially quite risky. @theuni okayed this removal [here](https://github.com/bitcoin/bitcoin/pull/4740#issuecomment-53076840).
Build-osx: Force Fix.

Kills the "make" line as well.