qt: Remove '0 BTC' placeholder from translation
fix compilation error in core_io.h

- error: 'vector' in namespace 'std' does not name a type
- add <vector> include in core_io.h
- remove <vector> includes from core_read.cpp and core_write.cpp
add license header to core_io.h, core_read/_write.cpp
Merge branch 'merge-rawtx2' into merge-rawtx3
build: don't let libtool insert rpath into binaries
build: Find the proper xcb/pcre dependencies
build: add WIP dependency builder.

This is in constant flux and is not ready for any real use.
travis: initial config
gitian: replace descriptors