Travis build setup & Makefile template

SOD does not generally require a Makefile to build. Just drop sod.c and its accompanying header files on your source tree and you are done.

.travis.yml

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+language: c
+compiler: clang
+script: make

Makefile

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+# SOD does not generally require a Makefile to build. Just drop sod.c and its accompanying
+# header files on your source tree and you are done.
+CC = clang
+CFLAGS = -lm -Ofast -march=native -Wall -std=c99
+
+sod: sod.c
+	$(CC) sod.c samples/cnn_face_detection.c -o sod_face_detect -I. $(CFLAGS)