Better error message if sketch too big

Used Arduino Leonardo Board and IDE 1.6.1 on Windows 8.1

```
Sketch uses 31,416 bytes (109%) of program storage space. Maximum is 28,672 bytes.
Global variables use 1,335 bytes (52%) of dynamic memory, leaving 1,225 bytes for local variables. Maximum is 2,560 bytes.
processing.app.debug.RunnerException: Sketch too big; see http://www.arduino.cc/en/Guide/Troubleshooting#size for tips on reducing it.
at processing.app.debug.Compiler.size(Compiler.java:325)
at processing.app.debug.Compiler.build(Compiler.java:117)
at processing.app.Sketch.build(Sketch.java:1169)
at processing.app.Sketch.build(Sketch.java:1142)
at processing.app.Editor$BuildHandler.run(Editor.java:1977)
at java.lang.Thread.run(Thread.java:745)
Sketch too big; see http://www.arduino.cc/en/Guide/Troubleshooting#size for tips on reducing it.
```

Start at processing.app.debug.Compiler.size(Compiler.java:325) and follow the build path shown through Compiler.build and Sketch.build. Reproduce the oversized-sketch output from the issue, then determine what information the error message should communicate more clearly. Done means the oversized sketch reports a better message without losing the existing size details.

Written by the indexing model from the issue text.