Do not line buffer code generator output

Line buffering results in slow performance on FUSE- and network-based
file systems, e.g., eCryptfs.  std::ostream << std::endl emits a
newline and flushes buffers to the kernel[1], yielding excessive
system calls.  Instead, emit "\n" which does the equivalent without
the flush[2].  The attached patch accomplishes this while minimizing
code churn by removing "using namespace std" and introducing a static
variable endl.

[1] http://www.cplusplus.com/reference/ios/endl/
[2] http://stackoverflow.com/questions/5492380/what-is-the-c-iostream-endl-fiasco