Change to versioning only by git tag (#108)

Versioning based on VERSION file was not practical and generated a
lot of mistakes when releasing new versions.

.travis.yml

@@ -8,6 +8,7 @@ deploy:
   api_key:
     secure: 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
   skip_cleanup: true
-  file: target/executor-linux-amd64.zip
+  file_glob: true
+  file: target/*.zip
   on:
     tags: true

Makefile

@@ -1,8 +1,7 @@
 APPLICATION_NAME    := github.com/allegro/mesos-executor
-APPLICATION_VERSION := $(shell cat VERSION)
+APPLICATION_VERSION := $(shell git describe --tags || echo "unknown")
 
 LDFLAGS := -X main.Version=$(APPLICATION_VERSION)
-USER_ID := `id -u $$USER`
 
 BUILD_FOLDER := target
 
@@ -45,8 +44,8 @@ lint-deps:
 		(go get -u -v gopkg.in/alecthomas/gometalinter.v2 && gometalinter.v2 --install)
 
 package: build
-	zip -j $(BUILD_FOLDER)/executor-linux-amd64.zip $(BUILD_FOLDER)/executor
-	chmod 0755 $(BUILD_FOLDER)/executor-linux-amd64.zip
+	zip -j $(BUILD_FOLDER)/executor-$(APPLICATION_VERSION)-linux-amd64.zip $(BUILD_FOLDER)/executor
+	chmod 0755 $(BUILD_FOLDER)/executor-$(APPLICATION_VERSION)-linux-amd64.zip
 	chmod 0777 $(BUILD_FOLDER)
 
 test: $(COVERAGEDIR)/coverage.out