obj: support object names with curly braces. (#1429)
obj: support object names with curly braces. (#1429)

Example files like

```
/usr/share/mozilla/extensions/{ec8030f7-c20a-464f-9b0e-13a3a9e97384}/ubufox@ubuntu.com.xpi
Song's Son.ogg
```

Should be supported.
dvstate/minio,abperiasamy/minio,fwessels/minio,abperiasamy/minio,luomeiqin/minio,dutchcoders/minio,fwessels/minio,aead/minio,krishnasrinivas/minio,NitishT/minio,jimjag/minio,mf-00/newgo,donatello/minio,abperiasamy/minio,fwessels/minio,luomeiqin/minio,aead/minio,aead/minio,brendanashworth/minio,harshavardhana/minio,krisis/minio,NitishT/minio,dutchcoders/minio,koolhead17/minio,mf-00/newgo,krishnasrinivas/minio,harshavardhana/minio,vadmeste/minio,aead/minio,harshavardhana/minio,hackintoshrao/minio,krishnasrinivas/minio,jimjag/minio,krishnasrinivas/minio,hackintoshrao/minio,rushenn/minio,minio/minio,rushenn/minio,minio/minio,krishnasrinivas/minio-daily,rajivm/minio,hackintoshrao/minio,aead/minio,brendanashworth/minio,luomeiqin/minio,dvstate/minio,NitishT/minio,alexellis/minio,koolhead17/minio,harshavardhana/minio,jimjag/minio,balamurugana/minio,balamurugana/minio,aead/minio,krishnasrinivas/minio-daily,aead/minio,rushenn/minio,dutchcoders/minio,luomeiqin/minio,jimjag/minio,vadmeste/minio,harshavardhana/minio,aead/minio,rajivm/minio,brendanashworth/minio,harshavardhana/minio,NitishT/minio,brendanashworth/minio,dvstate/minio,abperiasamy/minio,harshavardhana/minio,mkash32/minio,krisis/minio,donatello/minio,dvstate/minio,rushenn/minio,mkash32/minio,fwessels/minio,alexellis/minio,dutchcoders/minio,harshavardhana/minio,hackintoshrao/minio