Kill Xcode 5.1 warnings
Link libicucore.dylib with -L to avoid 3 warnings
Remove unused function log_queue
Merge pull request #153 from square/federman/kill_warnings

Kill Xcode 5.1 warnings
Use Apple's provided base64 implementation.
Merge pull request #160 from square/kve/kve/RI-3784

[Master] Use Apple's provided base64 implementation.
Fix size conversion warnings.
Merge pull request #162 from square/alanf/fix-size-conversion-warnings

Fix size conversion warnings.

Reviewed by @firestone.