Adds --show option to list files being built on run/push

fixes #90 

```
>> tessel push index.js --show
TESSEL! Connected to TM-00-04-f000da30-005d4344-60782586.
INFO Bundling directory /Users/jialiya/projects/technical/test/pins (~838 bytes)
  tessel compiling +0ms _start.js
  tessel writing +10ms _start.js
  tessel compiling +1ms app/index.js
  tessel writing +3ms app/index.js
INFO Deploying bundle (4.50 KB)...
INFO Finished deployment
INFO Run "tessel logs" or "tessel push <script.js> -l" to see logged output.
```

Also removed deprecated `tessel run --version` command.
While we're here, can we get rid of the estimated size parenthetical?