Add unit testing framework from libite (-lite)

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

tests/Makefile.am

@@ -0,0 +1,11 @@
+EXTRA_DIST      = check.h
+CLEANFILES      = *~ *.trs *.log
+
+TESTS           =
+
+check_PROGRAMS  = $(TESTS)
+
+# Ignore warnings about unused result, in e.g. write()
+CFLAGS          = -W -Wall -Wextra -Wno-unused-result
+CPPFLAGS        = -D_GNU_SOURCE
+LDADD           = -L../ ../libuev.la