all: Prune trailing whitespace.

Prune trailing whitespace across the whole project (almost), done
automatically with:

    grep -IUrl --color "[[:blank:]]$" --exclude-dir=.git --exclude=*.exp |\
        xargs sed -i 's/[[:space:]]*$//'

Exceptions:
- Skip third-party code in lib/ and drivers/cc3100/
- Skip generated code in bluetooth_init_cc2564C_1.5.c
- Preserve command output whitespace in docs, eg:
  docs/esp8266/tutorial/repl.rst

Signed-off-by: Phil Howard <phil@gadgetoid.com>

tests/basics/generator_throw.py

@@ -2,7 +2,7 @@
 def gen():
     yield 123
     yield 456
-        
+
 g = gen()
 print(next(g))
 try:
@@ -31,7 +31,7 @@ def gen():
     except GeneratorExit as e:
         print('GeneratorExit', repr(e.args))
     yield 456
-        
+
 # thrown a class
 g = gen()
 print(next(g))