IAM - Missing file - all.txt

[bdotgradb]

For the IAM example, the first two commands complete successfully but the third command results in an error:
./steps/download.sh --iam_user "$IAM_USER" --iam_pass "$IAM_PASS";
./steps/prepare_images.sh;
./steps/prepare_iam_text.sh --partition aachen;
awk: cannot open data/lang/lines/char/all.txt (No such file or directory)
ERROR: Creating file data/lang/lines/char/all_wspace.txt

[bdotgradb]

OK, I think I found the problems and resolved them. Please review #24

[jpuigcerver]

Thank you so much for spotting all these bugs.