Changes names from camelCase to under_score style
Fixes error relating to _GNU_SOURCE redefinition
Changes name of struct element from rodsEnv to rods_env
Adds explicit cast to iquest_fuse_t* for fuse context data
Guards AUTHSCHEME_KRB against kerberos not being included in iRODS config
Guards SYS_AUTH_EXPIRED against iRODS not having kerberos configured
Moves declaration of int i to avoid gcc 4 error regarding cleanup jump
Adds more explicit pointer casts to address gcc 4 warnings
Fixes compilation errors with gcc 4 (forces gnu99 mode)

Adds generated obj/ and bin/ directories to .gitignore
Merge branch 'master' of https://github.com/wtsi-hgi/iquestFuse