Bugfixes: del-, try-except-, and import-as-syntax

[gemoe100]

While using codegen I noticed that the following code examples could not be parsed to an ast and then translated back again to source code with codegen:

# example 1dell[0]
# example 2delobj.x# example 3try:
'#'[2]
exceptIndexError:
print'What did you expect?!'# example 4try:
l= []
l[1]
exceptIndexError, index_error:
printindex_error# example 5importintertoolsasiterators# example 6frommathimportfloorasfl, ceilascl

So I forked the code, fixed these issues and now I'd like to contribute my fixes to the actual repository.

[andreif]

Thanks, @gemoe100 ! Although, I haven't decide yet whether to improve the original code or not. I use it for inlines only myself. If you need something better, please have a look at https://github.com/pmaupin/astor