minor #30326 Additional addons for the ghost (przemyslaw-bogusz)
minor #30326 Additional addons for the ghost (przemyslaw-bogusz)

This PR was merged into the 4.3-dev branch.

Discussion
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Additional addons for the ghost

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT

Following #30236 I've prepared two additional addons for the ghost.

The first one will display a plus on February 29, to indicate it's a leap year.
![ghost-plus](https://user-images.githubusercontent.com/35422131/53133091-3730ce00-3572-11e9-89f7-44568d796f7e.png)

The second one will display a gift on October 18, to indicate it's Symfony's birthday.
![ghost-gift](https://user-images.githubusercontent.com/35422131/53133127-5596c980-3572-11e9-8901-704785e235a8.png)

I would just like to point out that the addons are purely for fun, to amuse every hardcoding Symfony developer and offer a chance to smile on these few selected occasions.

Commits
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51ed942ef5 Additional addons for the ghost

nicolas-grekas/symfony,jvasseur/symfony,sgehrig/symfony,phramz/symfony,Simperfit/symfony,andrerom/symfony,Deamon/symfony,damienalexandre/symfony,OskarStark/symfony,d-ph/symfony,jvasseur/symfony,gnat42/symfony,Nyholm/symfony,1ed/symfony,derrabus/symfony,jakzal/symfony,dmaicher/symfony,ajgarlag/symfony,ragboyjr/symfony,voronkovich/symfony,garak/symfony,Koc/symfony,d-ph/symfony,1ed/symfony,1ed/symfony,lyrixx/symfony,maidmaid/symfony,nicolas-grekas/symfony,andreia/symfony,HeahDude/symfony,Slamdunk/symfony,lstrojny/symfony,tgalopin/symfony,paradajozsef/symfony,mpdude/symfony,ogizanagi/symfony,zerkms/symfony,jderusse/symfony,tucksaun/symfony,jakzal/symfony,Deamon/symfony,gnat42/symfony,Deamon/symfony,mpdude/symfony,zcodes/symfony,jakzal/symfony,zorn-v/symfony,d-ph/symfony,teohhanhui/symfony,ro0NL/symfony,Simperfit/symfony,pyrech/symfony,tucksaun/symfony,stof/symfony,chalasr/symfony,sgehrig/symfony,localheinz/symfony,joelwurtz/symfony,derrabus/symfony,localheinz/symfony,tucksaun/symfony,arjenm/symfony,mweimerskirch/symfony,andreia/symfony,ogizanagi/symfony,symfony/symfony,shieldo/symfony,mnapoli/symfony,Deamon/symfony,alekitto/symfony,Nyholm/symfony,shieldo/symfony,ragboyjr/symfony,ogizanagi/symfony,tgalopin/symfony,ragboyjr/symfony,kbond/symfony,maidmaid/symfony,jderusse/symfony,zerkms/symfony,kbond/symfony,zerkms/symfony,damienalexandre/symfony,derrabus/symfony,lstrojny/symfony,OskarStark/symfony,oleg-andreyev/symfony,bendavies/symfony,romaricdrigon/symfony,voronkovich/symfony,arjenm/symfony,voronkovich/symfony,joelwurtz/symfony,oleg-andreyev/symfony,HeahDude/symfony,gonzalovilaseca/symfony,Koc/symfony,andrerom/symfony,shieldo/symfony,pierredup/symfony,Tobion/symfony,fabpot/symfony,jvasseur/symfony,romaricdrigon/symfony,smatyas/symfony,romaricdrigon/symfony,teohhanhui/symfony,yceruto/symfony,ragboyjr/symfony,gonzalovilaseca/symfony,nicolas-grekas/symfony,dmaicher/symfony,localheinz/symfony,mweimerskirch/symfony,jderusse/symfony,xabbuh/symfony,Simperfit/symfony,zorn-v/symfony,symfony/symfony,Taluu/symfony,mnapoli/symfony,pierredup/symfony,derrabus/symfony,andrerom/symfony,sroze/symfony,romaricdrigon/symfony,docteurklein/symfony,dmaicher/symfony,oleg-andreyev/symfony,jderusse/symfony,gnat42/symfony,gonzalovilaseca/symfony,docteurklein/symfony,Koc/symfony,gonzalovilaseca/symfony,docteurklein/symfony,tucksaun/symfony,zerkms/symfony,Nyholm/symfony,teohhanhui/symfony,mpdude/symfony,maidmaid/symfony,zorn-v/symfony,joelwurtz/symfony,mnapoli/symfony,stof/symfony,Slamdunk/symfony,maidmaid/symfony,ro0NL/symfony,lyrixx/symfony,pierredup/symfony,bendavies/symfony,fabpot/symfony,pyrech/symfony,MatTheCat/symfony,localheinz/symfony,xabbuh/symfony,ogizanagi/symfony,stof/symfony,bendavies/symfony,stof/symfony,yceruto/symfony,Tobion/symfony,sroze/symfony,sgehrig/symfony,Tobion/symfony,zorn-v/symfony,fabpot/symfony,damienalexandre/symfony,garak/symfony,kbond/symfony,gnat42/symfony,pyrech/symfony,ro0NL/symfony,kbond/symfony,vincentaubert/symfony,paradajozsef/symfony,docteurklein/symfony,Slamdunk/symfony,mweimerskirch/symfony,ajgarlag/symfony,phramz/symfony,lyrixx/symfony,OskarStark/symfony,HeahDude/symfony,vincentaubert/symfony,dmaicher/symfony,vincentaubert/symfony,hhamon/symfony,lyrixx/symfony,garak/symfony,smatyas/symfony,hhamon/symfony,ajgarlag/symfony,ro0NL/symfony,Taluu/symfony,garak/symfony,alekitto/symfony,Slamdunk/symfony,Simperfit/symfony,sroze/symfony,smatyas/symfony,symfony/symfony,nicolas-grekas/symfony,zcodes/symfony,zcodes/symfony,phramz/symfony,smatyas/symfony,1ed/symfony,curry684/symfony,docteurklein/symfony,tgalopin/symfony,mnapoli/symfony,vincentaubert/symfony,teohhanhui/symfony,Tobion/symfony,HeahDude/symfony,jvasseur/symfony,andrerom/symfony,chalasr/symfony,Taluu/symfony,Taluu/symfony,tgalopin/symfony,curry684/symfony,symfony/symfony,hhamon/symfony,mweimerskirch/symfony,lstrojny/symfony,shieldo/symfony,Simperfit/symfony,alekitto/symfony,MatTheCat/symfony,smatyas/symfony,andreia/symfony,damienalexandre/symfony,arjenm/symfony,xabbuh/symfony,joelwurtz/symfony,curry684/symfony,curry684/symfony,MatTheCat/symfony,OskarStark/symfony,sgehrig/symfony,sroze/symfony,xabbuh/symfony,mnapoli/symfony,chalasr/symfony,ajgarlag/symfony,voronkovich/symfony,mweimerskirch/symfony,yceruto/symfony,pierredup/symfony,jakzal/symfony,Koc/symfony,Nyholm/symfony,oleg-andreyev/symfony,paradajozsef/symfony,paradajozsef/symfony,zcodes/symfony,andreia/symfony,bendavies/symfony,pyrech/symfony,Deamon/symfony,alekitto/symfony,hhamon/symfony,mpdude/symfony,arjenm/symfony,MatTheCat/symfony,phramz/symfony,d-ph/symfony,yceruto/symfony,chalasr/symfony,fabpot/symfony