Update submodule micro-CDR to latest Fri Apr 13 20:26:46 CDT 2018

    - micro-CDR in PX4/Firmware (845b121): eProsima/Micro-CDR@50776f4
    - micro-CDR current upstream: eProsima/Micro-CDR@309c5ce
    - Changes: eProsima/Micro-CDR@50776f4...309c5ce

    309c5ce 2017-12-13 Borja Outerelo - Refs #2393. Adds missing line on deserialization
c3eef39 2017-12-07 julianbermudez - Refs #2383. Added client.h to header file.
fbecfae 2017-12-05 Vicente Monge - Refs #2381. .stg cleanning for c types
f401638 2017-12-05 Vicente Monge - Refs #2381. Avoid double \nin auto generated lines
9767808 2017-12-05 Borja Outerelo - Refs #2381. Adds simple IDL C types
6e65c09 2017-12-05 julianbermudez - Refs #2381. Added C Bacics Types.
edcddfc 2017-12-05 Vicente Monge - Refs #2381. Change stg file from FastCdrCommon.stg to MicroCdrCommon.stg
922ea32 2017-12-05 Borja Outerelo - Creates branch for micrortpsgen related code
cf0fd98 2017-12-01 Borja Outerelo - Refs #2375. Adds licenses
afc70df 2017-11-30 Borja Outerelo - Removes extern warning
a4a754f 2017-11-29 Borja Outerelo - Refs 2362. Extern Endianness check result
e56a5cb 2017-11-20 Borja Outerelo - Fixes Nuttx compilation. Fixeds endianness detection
04cc754 2017-11-03 Luis Enrique Muñoz Martín - [fix bug]: serialization arrays with units with bytes 2,4,8 count their size bad
e41b726 2017-11-02 Luis Enrique Muñoz Martín - [fix bug]: alignment after arrays doesnt work
fda82f0 2017-10-30 Luis Enrique Muñoz Martín - MACHINNE_ENDIANNESS definition is public now
e65c0db 2017-10-26 Luis Enrique Muñoz Martín - fix deserialize limit buffer bug
69f059f 2017-10-26 Luis Enrique Muñoz Martín - fix bug at array with elements higher than a byte
014b4ca 2017-10-25 Luis Enrique Muñoz Martín - fix endianness bug
5fe50b9 2017-10-24 Luis Enrique Muñoz Martín - sequences removed
213736f 2017-10-23 Luis Enrique Muñoz Martín - fix endianness setup
bbe0322 2017-10-19 Luis Enrique Muñoz Martín - removed some code comments
d8a95f6 2017-10-19 Luis Enrique Muñoz Martín - added MicroState
1a34ba0 2017-10-13 Luis Enrique Muñoz Martín - minor changes
bdacfaf 2017-10-09 Luis Enrique Muñoz Martín - Remove examples/performance_cmp_versions
4a91c2a 2017-10-09 Luis Enrique Muñoz Martín - add to .gitignore
3986ff6 2017-10-09 Luis Enrique Muñoz Martín - Actualizacion de README.rst
06ba6bd 2017-10-09 Luis Enrique Muñoz Martín - Release version 2.0.0
3e57dab 2017-10-09 Luis Enrique Muñoz Martín - Release version 2.0.0
e92a78e 2017-10-06 Luis Enrique Muñoz Martín - add basics tests
b19d6a8 2017-10-06 Luis Enrique Muñoz Martín - performance test. dynamic buffers. doc
8005b76 2017-10-05 Luis Enrique Muñoz Martín - New API (definition and implementation) done (no tested).
334ad53 2017-10-04 Luis Enrique Muñoz Martín - initial structure for the new changes
2ea6a1c 2017-10-04 Luis Enrique Muñoz Martín - initial structure for the new changes
4872048 2017-08-28 VicenteEprosima - Merge pull request #5 from dagar/pr-cmake_typo
54c5fec 2017-08-26 Daniel Agar - cmake fix message typo