v0.1.4

Simplify the generated node names from:

st4303462304=>start: start a_pyflow_test
op4302546112=>operation: do something
cond4303774096=>condition: Yes or No?
io4303237472=>inputoutput: output: something...
e4303275104=>end: end a_pyflow_test
sub4303240064=>subroutine: A Subroutine

st4303462304->op4302546112
op4302546112->cond4303774096
cond4303774096(yes)->io4303237472
io4303237472->e4303275104
cond4303774096(no)->sub4303240064
sub4303240064(right)->op4302546112

To:

st0=>start: start a_pyflow_test
op1=>operation: do something
cond2=>condition: Yes or No?
io3=>inputoutput: output: something...
e5=>end: end a_pyflow_test
sub4=>subroutine: A Subroutine

st0->op1
op1->cond2
cond2(yes)->io3
io3->e5
cond2(no)->sub4
sub4(right)->op1