Merge pull request #28 from apertium/empty-readings-warning Empty readings warning

Badges galore 

Bump to 5.0.0 

and don't fail if reading is empty string … 

don't crash if ambig bidix lemmas start with #@* 

put the symbol in knownness; don't import enum 

don't crash if empty readings (e.g. bidix entries like <e r="LR"><p><l>foo<s n="bar"/></r><l/></p></e> giving ^foo<bar>/$)

keep escapes, want to be able to reconstruct the input TODO: if one wants to remove them, there should be a function from lu's to lu's that does that +test

mature optimisation 

withText arg in parse_file