implement expose service, add tests, fix #140

Implements a kompose specific docker compose label "kompose.service.expose" which can be used to expose the specified services externally. The accepted values are of type string.
If the value is set to "true", the provider sets the endpoint automatically, and for any other value, the value is set as the hostname. If multiple ports are defined in a service, the first one is chosen to be the exposed.

Unit tests, functional tests, glide updates and docs have also been added in this commit for the related feature.

glide.lock

@@ -1,5 +1,5 @@
-hash: 3caf221b3b3a35894b12799f8a5047107b1d5c9237bfea1706af24ea525f97e6
-updated: 2016-12-16T16:41:13.456006508+05:30
+hash: a89b753597fba20c97e0ad6a0e3c840e0d2f98d6ac670f7c602c7327c35fe203
+updated: 2016-12-20T19:27:36.281252123+05:30
 imports:
 - name: cloud.google.com/go
   version: 3b1ae45394a234c385be014e9a488f2bb6eef821
@@ -210,7 +210,7 @@ imports:
 - name: github.com/evanphx/json-patch
   version: 465937c80b3c07a7c7ad20cc934898646a91c1de
 - name: github.com/fatih/structs
-  version: dc3312cb1a4513a366c4c9e622ad55c32df12ed3
+  version: be738c8546f55b34e60125afa50ed73a9a9c460e
 - name: github.com/flynn/go-shlex
   version: 3f9db97f856818214da2e1057f8ad84803971cff
 - name: github.com/fsouza/go-dockerclient
@@ -371,6 +371,8 @@ imports:
   - pkg/quota/api
   - pkg/quota/util
   - pkg/route/api
+  - pkg/route/api/install
+  - pkg/route/api/v1
   - pkg/sdn/api
   - pkg/security/api
   - pkg/template/api
@@ -396,7 +398,7 @@ imports:
 - name: github.com/prometheus/procfs
   version: 454a56f35412459b5e684fd5ec0f9211b94f002a
 - name: github.com/Sirupsen/logrus
-  version: 881bee4e20a5d11a6a88a5667c6f292072ac1963
+  version: 4b6ea7319e214d98c938f12692336f7ca9348d6b
 - name: github.com/spf13/cobra
   version: 7c674d9e72017ed25f6d2b5e497a1368086b6a6f
 - name: github.com/spf13/pflag
@@ -406,13 +408,13 @@ imports:
   subpackages:
   - codec
 - name: github.com/urfave/cli
-  version: 0bdeddeeb0f650497d603c4ad7b20cfe685682f6
+  version: 71f57d300dd6a780ac1856c005c4b518cfd498ec
 - name: github.com/xeipuuv/gojsonpointer
   version: e0fe6f68307607d540ed8eac07a342c33fa1b54a
 - name: github.com/xeipuuv/gojsonreference
   version: e02fc20de94c78484cd5ffb007f8af96be030a45
 - name: github.com/xeipuuv/gojsonschema
-  version: 59f99ebfe5f712a0055e321231fc3be94e4e00b2
+  version: ac452913faa25c08bb78810d3e6f88b8a39f8f25
 - name: golang.org/x/net
   version: e90d6d0afc4c315a0d87a568ae68577cc15149a0
   subpackages:
@@ -436,7 +438,7 @@ imports:
   - jws
   - jwt
 - name: golang.org/x/sys
-  version: d75a52659825e75fff6158388dddc6a5b04f9ba5
+  version: 833a04a10549a95dc34458c195cbad61bbb6cb4d
   subpackages:
   - unix
 - name: google.golang.org/appengine